diff --git a/block-storage/src/main/java/org/lucares/pdb/diskstorage/DiskStorage.java b/block-storage/src/main/java/org/lucares/pdb/diskstorage/DiskStorage.java
index e70d5a5..36436d5 100644
--- a/block-storage/src/main/java/org/lucares/pdb/diskstorage/DiskStorage.java
+++ b/block-storage/src/main/java/org/lucares/pdb/diskstorage/DiskStorage.java
@@ -53,6 +53,7 @@ public class DiskStorage implements AutoCloseable {
         try {
             LOGGER.trace("read block={} file={}", blockOffset, relativeDatabaseFileForLogging);
 
+            DiskStoreStats.incrementDiskRead();
             final var byteBuffer = fileChannel.map(MapMode.READ_WRITE, blockOffset, blockSize);
 
             return new DiskBlock(blockOffset, byteBuffer);
@@ -227,6 +228,7 @@ public class DiskStorage implements AutoCloseable {
 
     private FreeListNode readFreeListNode(final long freeListNodePosition) throws IOException {
         final var freeListNode = ByteBuffer.allocate(FREE_LIST_NODE_SIZE);
+        DiskStoreStats.incrementDiskRead();
         fileChannel.read(freeListNode, freeListNodePosition);
         final long offset = freeListNodePosition;
         final long next = freeListNode.getLong(FREE_LIST_NEXT_POINTER);
@@ -250,6 +252,7 @@ public class DiskStorage implements AutoCloseable {
 
     private long readFreeListRootNodePosition() throws IOException {
         final var freeListFirstBlock = ByteBuffer.allocate(8);
+        DiskStoreStats.incrementDiskRead();
         fileChannel.read(freeListFirstBlock, FREE_LIST_ROOT_OFFSET);
         return freeListFirstBlock.getLong(0);
     }
diff --git a/block-storage/src/main/java/org/lucares/pdb/diskstorage/DiskStoreStats.java b/block-storage/src/main/java/org/lucares/pdb/diskstorage/DiskStoreStats.java
new file mode 100644
index 0000000..7de30d9
--- /dev/null
+++ b/block-storage/src/main/java/org/lucares/pdb/diskstorage/DiskStoreStats.java
@@ -0,0 +1,24 @@
+package org.lucares.pdb.diskstorage;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+public class DiskStoreStats {
+    private static final AtomicLong diskRead = new AtomicLong(0);
+
+    public static void incrementDiskRead() {
+        diskRead.incrementAndGet();
+    }
+
+    public static void resetDiskRead() {
+        diskRead.set(0);
+    }
+
+    public static long getDiskRead() {
+        return diskRead.get();
+    }
+
+    public static long getAndResetDiskRead() {
+
+        return diskRead.getAndSet(0);
+    }
+}
diff --git a/block-storage/src/main/java/org/lucares/pdb/map/PersistentMapDiskNode.java b/block-storage/src/main/java/org/lucares/pdb/map/PersistentMapDiskNode.java
index 7693b55..133e37a 100644
--- a/block-storage/src/main/java/org/lucares/pdb/map/PersistentMapDiskNode.java
+++ b/block-storage/src/main/java/org/lucares/pdb/map/PersistentMapDiskNode.java
@@ -21,11 +21,11 @@ import org.lucares.utils.byteencoder.VariableByteEncoder;
  * <pre>
  * Node layout:
  *
- *  ◀───────   Prefix ──────▶          ◀───────────────── Suffix ──────────────────▶
+ *  ────────   Prefix ──────▶          ◀───────────────── Suffix ───────────────────
  * ┏━━━┳━━━━━┳━━━━━┳━━━━━┳━━━┳╸╺╸╺╸╺╸╺┳━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━┓
  * ┃ 6 ┃ 5,6 ┃ 3,6 ┃ 3,2 ┃ ∅ ┃        ┃"ba"->"147"┃"foobar"->"467"┃"foobaz"->"value"┃
  * ┗━━━┻━━━━━┻━━━━━┻━━━━━┻━━━┻╸╺╸╺╸╺╸╺┻━━━━━━━━━━━┻━━━━━━━━━━━━━━━┻━━━━━━━━━━━━━━━━━┛
- *   │   │ │   │ │   │ │   └▶  null byte that serves as a separator for the prefix.
+ *   │   │ │   │ │   │ │   └▶  null byte that serves as a terminator for the prefix.
  *   │   │ │   │ │   │ └▶ size of the third last key ("ba" in this example)
  *   │   │ │   │ │   └▶ size of the third last value ("147" in this example)
  *   │   │ │   │ └▶ size of the second last key ("foobar" in this example)
@@ -202,13 +202,13 @@ public class PersistentMapDiskNode {
                 + String.join("\n", entries.values().stream().map(NodeEntry::toString).collect(Collectors.toList()));
     }
 
-    public <K, V> String toString(Function<byte[], K> keyDecoder, Function<byte[], V> valueDecoder) {
-        StringBuilder result = new StringBuilder();
+    public <K, V> String toString(final Function<byte[], K> keyDecoder, final Function<byte[], V> valueDecoder) {
+        final StringBuilder result = new StringBuilder();
         result.append("@");
         result.append(nodeOffset);
         result.append(": ");
-        for (NodeEntry e : entries.values()) {
-            String s = e.toString(keyDecoder, valueDecoder);
+        for (final NodeEntry e : entries.values()) {
+            final String s = e.toString(keyDecoder, valueDecoder);
             result.append("\n");
             result.append(s);
         }
diff --git a/build.gradle b/build.gradle
index d10b2c4..036a2e8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -14,23 +14,23 @@ buildscript {
 
   dependencies {
   	// usage: gradlew dependencyUpdates -Drevision=release
-    classpath 'com.github.ben-manes:gradle-versions-plugin:0.29.0'
+    classpath 'com.github.ben-manes:gradle-versions-plugin:0.33.0'
   }
 }
 
 ext {
 
-    javaVersion=12
+    javaVersion=14
     
     version_log4j2= '2.13.3' // keep in sync with spring-boot-starter-log4j2
-    version_spring = '2.3.2.RELEASE'
-    version_junit = '5.6.1'
-    version_junit_platform = '1.6.1'
+    version_spring = '2.3.4.RELEASE'
+    version_junit = '5.7.0'
+    version_junit_platform = '1.7.0'
     
     lib_antlr = "org.antlr:antlr4:4.8-1"
     
     lib_commons_collections4 = 'org.apache.commons:commons-collections4:4.4'
-    lib_commons_lang3 = 'org.apache.commons:commons-lang3:3.10'
+    lib_commons_lang3 = 'org.apache.commons:commons-lang3:3.11'
     lib_jackson_databind = 'com.fasterxml.jackson.core:jackson-databind:2.11.2'
     
     lib_log4j2_core = "org.apache.logging.log4j:log4j-core:${version_log4j2}"
@@ -92,7 +92,7 @@ subprojects {
 	
 	// dependencies that all sub-projects have 
 	dependencies {
-    testImplementation "org.junit.jupiter:junit-jupiter-engine:${version_junit}"
+    testImplementation("org.junit.jupiter:junit-jupiter-engine:${version_junit}")
     testImplementation "org.junit.jupiter:junit-jupiter-params:${version_junit}"  // for @ParameterizedTest
     testImplementation "org.junit.platform:junit-platform-launcher:${version_junit_platform}" // needed by eclipse
   }
diff --git a/data-store/src/main/java/org/lucares/pdb/datastore/internal/DataStore.java b/data-store/src/main/java/org/lucares/pdb/datastore/internal/DataStore.java
index a53019e..a908994 100644
--- a/data-store/src/main/java/org/lucares/pdb/datastore/internal/DataStore.java
+++ b/data-store/src/main/java/org/lucares/pdb/datastore/internal/DataStore.java
@@ -32,6 +32,7 @@ import org.lucares.pdb.datastore.lang.Expression;
 import org.lucares.pdb.datastore.lang.ExpressionToDocIdVisitor;
 import org.lucares.pdb.datastore.lang.NewProposerParser;
 import org.lucares.pdb.datastore.lang.QueryLanguageParser;
+import org.lucares.pdb.diskstorage.DiskStoreStats;
 import org.lucares.pdb.map.PersistentMap;
 import org.lucares.utils.Preconditions;
 import org.lucares.utils.cache.HotEntryCache;
@@ -235,11 +236,16 @@ public class DataStore implements AutoCloseable {
 
     public List<Doc> search(final Query query) {
         try {
+            DiskStoreStats.resetDiskRead();
             final List<Doc> result = new ArrayList<>();
 
             final PartitionLongList docIdsList = executeQuery(query);
             LOGGER.trace("query {} found {} docs", query, docIdsList.size());
+
+            DiskStoreStats.incrementDiskRead();
+            LOGGER.info("Disk reads - search {}", DiskStoreStats.getAndResetDiskRead());
             final List<Doc> docs = mapDocIdsToDocs(docIdsList);
+            LOGGER.info("Disk reads - mappedToDocIds {}", DiskStoreStats.getAndResetDiskRead());
             result.addAll(docs);
 
             return result;
diff --git a/data-store/src/main/java/org/lucares/pdb/datastore/internal/DateIndexExtension.java b/data-store/src/main/java/org/lucares/pdb/datastore/internal/DateIndexExtension.java
index 3d227b1..f305b05 100644
--- a/data-store/src/main/java/org/lucares/pdb/datastore/internal/DateIndexExtension.java
+++ b/data-store/src/main/java/org/lucares/pdb/datastore/internal/DateIndexExtension.java
@@ -1,6 +1,5 @@
 package org.lucares.pdb.datastore.internal;
 
-import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.LinkedHashSet;
@@ -8,11 +7,12 @@ import java.util.List;
 import java.util.Set;
 
 import org.lucares.pdb.api.DateTimeRange;
+import org.lucares.utils.DateBucketUnit;
 import org.lucares.utils.LongToDateBucket;
 
 public class DateIndexExtension {
 
-    private static final LongToDateBucket longToDateBucket = new LongToDateBucket("yyyyMM", ChronoUnit.MONTHS);
+    private static final LongToDateBucket longToDateBucket = new LongToDateBucket("yyyyMM", DateBucketUnit.MONTH);
 
     static Set<String> toDateIndexPrefix(final DateTimeRange dateRange) {
         return longToDateBucket.toDateIndexPrefix(dateRange.getStart(), dateRange.getEnd());
@@ -31,7 +31,7 @@ public class DateIndexExtension {
      */
     static List<ParititionId> toPartitionIds(final DateTimeRange dateRange) {
         final List<String> partitionIds = longToDateBucket.toPartitionIds(dateRange.getStart(), dateRange.getEnd(),
-                ChronoUnit.MONTHS);
+                DateBucketUnit.MONTH);
 
         final List<ParititionId> result = new ArrayList<>();
         for (final String partitionId : partitionIds) {
diff --git a/pdb-js/package-lock.json b/pdb-js/package-lock.json
index 4818130..9f629f4 100644
--- a/pdb-js/package-lock.json
+++ b/pdb-js/package-lock.json
@@ -5,25 +5,42 @@
   "requires": true,
   "dependencies": {
     "@angular-devkit/architect": {
-      "version": "0.1000.5",
-      "resolved": "https://registry.npmjs.org/@angular-devkit/architect/-/architect-0.1000.5.tgz",
-      "integrity": "sha512-BhNqB7fmmrDQwxoJ3zdw5FslFD+nYGgMTiC48ERVYJVuN3BK6xtt2OGA7vho3eJ13OE5cPGUi8crQDRROgxxQg==",
+      "version": "0.1000.8",
+      "resolved": "https://registry.npmjs.org/@angular-devkit/architect/-/architect-0.1000.8.tgz",
+      "integrity": "sha512-2AqPbiEugtPxNz4MGhLh+imUVelhW9h1cdJs2AbxZosIxftPb5DNDQUSAwVmRGp4CtcXVrlvcDwc0f4Fw1aiIA==",
       "dev": true,
       "requires": {
-        "@angular-devkit/core": "10.0.5",
+        "@angular-devkit/core": "10.0.8",
         "rxjs": "6.5.5"
+      },
+      "dependencies": {
+        "rxjs": {
+          "version": "6.5.5",
+          "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.5.5.tgz",
+          "integrity": "sha512-WfQI+1gohdf0Dai/Bbmk5L5ItH5tYqm3ki2c5GdWhKjalzjg93N3avFjVStyZZz+A2Em+ZxKH5bNghw9UeylGQ==",
+          "dev": true,
+          "requires": {
+            "tslib": "^1.9.0"
+          }
+        },
+        "tslib": {
+          "version": "1.13.0",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.13.0.tgz",
+          "integrity": "sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==",
+          "dev": true
+        }
       }
     },
     "@angular-devkit/build-angular": {
-      "version": "0.1000.5",
-      "resolved": "https://registry.npmjs.org/@angular-devkit/build-angular/-/build-angular-0.1000.5.tgz",
-      "integrity": "sha512-YOlYdOksFsirCV7l2S0T/k9phRtT5eR+Pk3uWHXGfrkCBzFlAHw1EqOlJLOOSuN+stGHHYnKES2WUVJRJXLlCQ==",
+      "version": "0.1000.8",
+      "resolved": "https://registry.npmjs.org/@angular-devkit/build-angular/-/build-angular-0.1000.8.tgz",
+      "integrity": "sha512-wwDN2oadQvYPL7lDmvGsoWQjW++0ZnxWk1QVlABGhBSIs8Uxs26Hjd5YNUSsvJavBkqb1UZIOilqzb4dig5MIA==",
       "dev": true,
       "requires": {
-        "@angular-devkit/architect": "0.1000.5",
-        "@angular-devkit/build-optimizer": "0.1000.5",
-        "@angular-devkit/build-webpack": "0.1000.5",
-        "@angular-devkit/core": "10.0.5",
+        "@angular-devkit/architect": "0.1000.8",
+        "@angular-devkit/build-optimizer": "0.1000.8",
+        "@angular-devkit/build-webpack": "0.1000.8",
+        "@angular-devkit/core": "10.0.8",
         "@babel/core": "7.9.6",
         "@babel/generator": "7.9.6",
         "@babel/plugin-transform-runtime": "7.9.6",
@@ -31,7 +48,7 @@
         "@babel/runtime": "7.9.6",
         "@babel/template": "7.8.6",
         "@jsdevtools/coverage-istanbul-loader": "3.0.3",
-        "@ngtools/webpack": "10.0.5",
+        "@ngtools/webpack": "10.0.8",
         "ajv": "6.12.3",
         "autoprefixer": "9.8.0",
         "babel-loader": "8.1.0",
@@ -87,74 +104,6 @@
         "worker-plugin": "4.0.3"
       },
       "dependencies": {
-        "@babel/code-frame": {
-          "version": "7.10.4",
-          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
-          "integrity": "sha512-vG6SvB6oYEhvgisZNFRmRCUkLz11c7rp+tbNTynGqc6mS1d5ATd/sGyV6W0KZZnXRKMTzZDRgQT3Ou9jhpAfUg==",
-          "dev": true,
-          "requires": {
-            "@babel/highlight": "^7.10.4"
-          }
-        },
-        "@babel/generator": {
-          "version": "7.9.6",
-          "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.9.6.tgz",
-          "integrity": "sha512-+htwWKJbH2bL72HRluF8zumBxzuX0ZZUFl3JLNyoUjM/Ho8wnVpPXM6aUz8cfKDqQ/h7zHqKt4xzJteUosckqQ==",
-          "dev": true,
-          "requires": {
-            "@babel/types": "^7.9.6",
-            "jsesc": "^2.5.1",
-            "lodash": "^4.17.13",
-            "source-map": "^0.5.0"
-          },
-          "dependencies": {
-            "source-map": {
-              "version": "0.5.7",
-              "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-              "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-              "dev": true
-            }
-          }
-        },
-        "@babel/helper-validator-identifier": {
-          "version": "7.10.4",
-          "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
-          "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==",
-          "dev": true
-        },
-        "@babel/highlight": {
-          "version": "7.10.4",
-          "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
-          "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
-          "dev": true,
-          "requires": {
-            "@babel/helper-validator-identifier": "^7.10.4",
-            "chalk": "^2.0.0",
-            "js-tokens": "^4.0.0"
-          }
-        },
-        "@babel/template": {
-          "version": "7.8.6",
-          "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.8.6.tgz",
-          "integrity": "sha512-zbMsPMy/v0PWFZEhQJ66bqjhH+z0JgMoBWuikXybgG3Gkd/3t5oQ1Rw2WQhnSrsOmsKXnZOx15tkC4qON/+JPg==",
-          "dev": true,
-          "requires": {
-            "@babel/code-frame": "^7.8.3",
-            "@babel/parser": "^7.8.6",
-            "@babel/types": "^7.8.6"
-          }
-        },
-        "@babel/types": {
-          "version": "7.11.0",
-          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.11.0.tgz",
-          "integrity": "sha512-O53yME4ZZI0jO1EVGtF1ePGl0LHirG4P1ibcD80XyzZcKhcMFeCXmh4Xb1ifGBIV233Qg12x4rBfQgA+tmOukA==",
-          "dev": true,
-          "requires": {
-            "@babel/helper-validator-identifier": "^7.10.4",
-            "lodash": "^4.17.19",
-            "to-fast-properties": "^2.0.0"
-          }
-        },
         "ajv": {
           "version": "6.12.3",
           "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.3.tgz",
@@ -190,6 +139,15 @@
             "glob": "^7.1.3"
           }
         },
+        "rxjs": {
+          "version": "6.5.5",
+          "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.5.5.tgz",
+          "integrity": "sha512-WfQI+1gohdf0Dai/Bbmk5L5ItH5tYqm3ki2c5GdWhKjalzjg93N3avFjVStyZZz+A2Em+ZxKH5bNghw9UeylGQ==",
+          "dev": true,
+          "requires": {
+            "tslib": "^1.9.0"
+          }
+        },
         "semver": {
           "version": "7.3.2",
           "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.2.tgz",
@@ -213,13 +171,19 @@
               "dev": true
             }
           }
+        },
+        "tslib": {
+          "version": "1.13.0",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.13.0.tgz",
+          "integrity": "sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==",
+          "dev": true
         }
       }
     },
     "@angular-devkit/build-optimizer": {
-      "version": "0.1000.5",
-      "resolved": "https://registry.npmjs.org/@angular-devkit/build-optimizer/-/build-optimizer-0.1000.5.tgz",
-      "integrity": "sha512-H6jTF7TOYq909HR6M3Bu8lScqrG1qznK2XMefK3m1I1jBJ+WO4bL7hrhTp/CIY3d+47txep+XqhitDWD/6ikpg==",
+      "version": "0.1000.8",
+      "resolved": "https://registry.npmjs.org/@angular-devkit/build-optimizer/-/build-optimizer-0.1000.8.tgz",
+      "integrity": "sha512-esODHuTGEEMx1SmLUq03VAMly8gZUd1vRuvZeKS5HqKwDg8ZzcI7/25BuuUSlyST+6BEdjo2gnmagQnG0VBdQw==",
       "dev": true,
       "requires": {
         "loader-utils": "2.0.0",
@@ -237,20 +201,37 @@
       }
     },
     "@angular-devkit/build-webpack": {
-      "version": "0.1000.5",
-      "resolved": "https://registry.npmjs.org/@angular-devkit/build-webpack/-/build-webpack-0.1000.5.tgz",
-      "integrity": "sha512-233EbW+6IKJEV20IG9Qzlz8MdDedzoTheB+lx9tTPn21m0ph2vmpTsNOsmMWwvdBBgXbv3pW3SMbJiqDCh7u4w==",
+      "version": "0.1000.8",
+      "resolved": "https://registry.npmjs.org/@angular-devkit/build-webpack/-/build-webpack-0.1000.8.tgz",
+      "integrity": "sha512-y/U+dV5N8W7KECncGSKQWoUH/DFNZCseczyl6LAd8bc0fMr8Z0TAIe8OXj+5CSRRdejWfRIxGtNWM+L2kTCU8A==",
       "dev": true,
       "requires": {
-        "@angular-devkit/architect": "0.1000.5",
-        "@angular-devkit/core": "10.0.5",
+        "@angular-devkit/architect": "0.1000.8",
+        "@angular-devkit/core": "10.0.8",
         "rxjs": "6.5.5"
+      },
+      "dependencies": {
+        "rxjs": {
+          "version": "6.5.5",
+          "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.5.5.tgz",
+          "integrity": "sha512-WfQI+1gohdf0Dai/Bbmk5L5ItH5tYqm3ki2c5GdWhKjalzjg93N3avFjVStyZZz+A2Em+ZxKH5bNghw9UeylGQ==",
+          "dev": true,
+          "requires": {
+            "tslib": "^1.9.0"
+          }
+        },
+        "tslib": {
+          "version": "1.13.0",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.13.0.tgz",
+          "integrity": "sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==",
+          "dev": true
+        }
       }
     },
     "@angular-devkit/core": {
-      "version": "10.0.5",
-      "resolved": "https://registry.npmjs.org/@angular-devkit/core/-/core-10.0.5.tgz",
-      "integrity": "sha512-ZaF1EYniIo+yRLvvaKnLrjYCdKeg2U3YtbA932M2AIfjgfFv/9mnAbH4jmZsBZhCstxZPz+ItwJesdR20h4Z1Q==",
+      "version": "10.0.8",
+      "resolved": "https://registry.npmjs.org/@angular-devkit/core/-/core-10.0.8.tgz",
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+              "version": "2.0.1",
+              "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
+              "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
+              "dev": true,
+              "requires": {
+                "is-extendable": "^0.1.0"
+              }
+            }
+          }
+        },
         "cacache": {
           "version": "12.0.4",
           "resolved": "https://registry.npmjs.org/cacache/-/cacache-12.0.4.tgz",
@@ -14153,6 +13361,29 @@
           "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg==",
           "dev": true
         },
+        "fill-range": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-4.0.0.tgz",
+          "integrity": "sha1-1USBHUKPmOsGpj3EAtJAPDKMOPc=",
+          "dev": true,
+          "requires": {
+            "extend-shallow": "^2.0.1",
+            "is-number": "^3.0.0",
+            "repeat-string": "^1.6.1",
+            "to-regex-range": "^2.1.0"
+          },
+          "dependencies": {
+            "extend-shallow": {
+              "version": "2.0.1",
+              "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
+              "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
+              "dev": true,
+              "requires": {
+                "is-extendable": "^0.1.0"
+              }
+            }
+          }
+        },
         "find-cache-dir": {
           "version": "2.1.0",
           "resolved": "https://registry.npmjs.org/find-cache-dir/-/find-cache-dir-2.1.0.tgz",
@@ -14164,6 +13395,26 @@
             "pkg-dir": "^3.0.0"
           }
         },
+        "is-number": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-number/-/is-number-3.0.0.tgz",
+          "integrity": "sha1-JP1iAaR4LPUFYcgQJ2r8fRLXEZU=",
+          "dev": true,
+          "requires": {
+            "kind-of": "^3.0.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "3.2.2",
+              "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+              "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
+              "dev": true,
+              "requires": {
+                "is-buffer": "^1.1.5"
+              }
+            }
+          }
+        },
         "is-wsl": {
           "version": "1.1.0",
           "resolved": "https://registry.npmjs.org/is-wsl/-/is-wsl-1.1.0.tgz",
@@ -14200,6 +13451,27 @@
             "readable-stream": "^2.0.1"
           }
         },
+        "micromatch": {
+          "version": "3.1.10",
+          "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-3.1.10.tgz",
+          "integrity": "sha512-MWikgl9n9M3w+bpsY3He8L+w9eF9338xRl8IAO5viDizwSzziFEyUzo2xrrloB64ADbTf8uA8vRqqttDTOmccg==",
+          "dev": true,
+          "requires": {
+            "arr-diff": "^4.0.0",
+            "array-unique": "^0.3.2",
+            "braces": "^2.3.1",
+            "define-property": "^2.0.2",
+            "extend-shallow": "^3.0.2",
+            "extglob": "^2.0.4",
+            "fragment-cache": "^0.2.1",
+            "kind-of": "^6.0.2",
+            "nanomatch": "^1.2.9",
+            "object.pick": "^1.3.0",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
+            "to-regex": "^3.0.2"
+          }
+        },
         "schema-utils": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-1.0.0.tgz",
@@ -14211,15 +13483,6 @@
             "ajv-keywords": "^3.1.0"
           }
         },
-        "serialize-javascript": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-3.1.0.tgz",
-          "integrity": "sha512-JIJT1DGiWmIKhzRsG91aS6Ze4sFUrYbltlkg2onR5OrnNM02Kl/hnY/T4FN2omvyeBbQmMJv+K4cPOpGzOTFBg==",
-          "dev": true,
-          "requires": {
-            "randombytes": "^2.1.0"
-          }
-        },
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -14236,21 +13499,31 @@
           }
         },
         "terser-webpack-plugin": {
-          "version": "1.4.4",
-          "resolved": "https://registry.npmjs.org/terser-webpack-plugin/-/terser-webpack-plugin-1.4.4.tgz",
-          "integrity": "sha512-U4mACBHIegmfoEe5fdongHESNJWqsGU+W0S/9+BmYGVQDw1+c2Ow05TpMhxjPK1sRb7cuYq1BPl1e5YHJMTCqA==",
+          "version": "1.4.5",
+          "resolved": "https://registry.npmjs.org/terser-webpack-plugin/-/terser-webpack-plugin-1.4.5.tgz",
+          "integrity": "sha512-04Rfe496lN8EYruwi6oPQkG0vo8C+HT49X687FZnpPF0qMAIHONI6HEXYPKDOE8e5HjXTyKfqRd/agHtH0kOtw==",
           "dev": true,
           "requires": {
             "cacache": "^12.0.2",
             "find-cache-dir": "^2.1.0",
             "is-wsl": "^1.1.0",
             "schema-utils": "^1.0.0",
-            "serialize-javascript": "^3.1.0",
+            "serialize-javascript": "^4.0.0",
             "source-map": "^0.6.1",
             "terser": "^4.1.2",
             "webpack-sources": "^1.4.0",
             "worker-farm": "^1.7.0"
           }
+        },
+        "to-regex-range": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-2.1.1.tgz",
+          "integrity": "sha1-fIDBe53+vlmeJzZ+DU3VWQFB2zg=",
+          "dev": true,
+          "requires": {
+            "is-number": "^3.0.0",
+            "repeat-string": "^1.6.1"
+          }
         }
       }
     },
@@ -14369,6 +13642,17 @@
             "snapdragon-node": "^2.0.1",
             "split-string": "^3.0.2",
             "to-regex": "^3.0.1"
+          },
+          "dependencies": {
+            "extend-shallow": {
+              "version": "2.0.1",
+              "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
+              "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
+              "dev": true,
+              "requires": {
+                "is-extendable": "^0.1.0"
+              }
+            }
           }
         },
         "chokidar": {
@@ -14391,15 +13675,6 @@
             "upath": "^1.1.1"
           }
         },
-        "extend-shallow": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
-          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
-          "dev": true,
-          "requires": {
-            "is-extendable": "^0.1.0"
-          }
-        },
         "fill-range": {
           "version": "4.0.0",
           "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-4.0.0.tgz",
@@ -14410,6 +13685,17 @@
             "is-number": "^3.0.0",
             "repeat-string": "^1.6.1",
             "to-regex-range": "^2.1.0"
+          },
+          "dependencies": {
+            "extend-shallow": {
+              "version": "2.0.1",
+              "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
+              "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
+              "dev": true,
+              "requires": {
+                "is-extendable": "^0.1.0"
+              }
+            }
           }
         },
         "fsevents": {
@@ -14417,9 +13703,27 @@
           "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.13.tgz",
           "integrity": "sha512-oWb1Z6mkHIskLzEJ/XWX0srkpkTQ7vaopMQkyaEIoq0fmtFVxOthb8cCxeT+p3ynTdkk/RZwbgG4brR5BeWECw==",
           "dev": true,
-          "optional": true,
+          "optional": true
+        },
+        "glob-parent": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-3.1.0.tgz",
+          "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
+          "dev": true,
           "requires": {
-            "nan": "^2.12.1"
+            "is-glob": "^3.1.0",
+            "path-dirname": "^1.0.0"
+          },
+          "dependencies": {
+            "is-glob": {
+              "version": "3.1.0",
+              "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-3.1.0.tgz",
+              "integrity": "sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=",
+              "dev": true,
+              "requires": {
+                "is-extglob": "^2.1.0"
+              }
+            }
           }
         },
         "is-absolute-url": {
@@ -14444,15 +13748,38 @@
           "dev": true,
           "requires": {
             "kind-of": "^3.0.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "3.2.2",
+              "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+              "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
+              "dev": true,
+              "requires": {
+                "is-buffer": "^1.1.5"
+              }
+            }
           }
         },
-        "kind-of": {
-          "version": "3.2.2",
-          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
-          "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
+        "micromatch": {
+          "version": "3.1.10",
+          "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-3.1.10.tgz",
+          "integrity": "sha512-MWikgl9n9M3w+bpsY3He8L+w9eF9338xRl8IAO5viDizwSzziFEyUzo2xrrloB64ADbTf8uA8vRqqttDTOmccg==",
           "dev": true,
           "requires": {
-            "is-buffer": "^1.1.5"
+            "arr-diff": "^4.0.0",
+            "array-unique": "^0.3.2",
+            "braces": "^2.3.1",
+            "define-property": "^2.0.2",
+            "extend-shallow": "^3.0.2",
+            "extglob": "^2.0.4",
+            "fragment-cache": "^0.2.1",
+            "kind-of": "^6.0.2",
+            "nanomatch": "^1.2.9",
+            "object.pick": "^1.3.0",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
+            "to-regex": "^3.0.2"
           }
         },
         "readdirp": {
@@ -14566,14 +13893,14 @@
       "dev": true
     },
     "whatwg-url": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-8.1.0.tgz",
-      "integrity": "sha512-vEIkwNi9Hqt4TV9RdnaBPNt+E2Sgmo3gePebCRgZ1R7g6d23+53zCTnuB0amKI4AXq6VM8jj2DUAa0S1vjJxkw==",
+      "version": "8.2.2",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-8.2.2.tgz",
+      "integrity": "sha512-PcVnO6NiewhkmzV0qn7A+UZ9Xx4maNTI+O+TShmfE4pqjoCMwUMjkvoNhNHPTvgR7QH9Xt3R13iHuWy2sToFxQ==",
       "dev": true,
       "requires": {
         "lodash.sortby": "^4.7.0",
         "tr46": "^2.0.2",
-        "webidl-conversions": "^5.0.0"
+        "webidl-conversions": "^6.1.0"
       }
     },
     "when": {
diff --git a/pdb-js/package.json b/pdb-js/package.json
index e06495b..439b095 100644
--- a/pdb-js/package.json
+++ b/pdb-js/package.json
@@ -12,30 +12,30 @@
   },
   "private": true,
   "dependencies": {
-    "@angular/animations": "^10.0.8",
-    "@angular/cdk": "^10.1.3",
-    "@angular/common": "^10.0.8",
-    "@angular/compiler": "^10.0.8",
-    "@angular/core": "^10.0.8",
-    "@angular/forms": "^10.0.8",
-    "@angular/material": "^10.1.3",
-    "@angular/platform-browser": "^10.0.8",
-    "@angular/platform-browser-dynamic": "^10.0.8",
-    "@angular/router": "^10.0.8",
-    "moment": "^2.27.0",
-    "rxjs": "^6.5.5",
-    "rxjs-compat": "^6.5.5",
+    "@angular/animations": "^10.1.2",
+    "@angular/cdk": "^10.2.1",
+    "@angular/common": "^10.1.2",
+    "@angular/compiler": "^10.1.2",
+    "@angular/core": "^10.1.2",
+    "@angular/forms": "^10.1.2",
+    "@angular/material": "^10.2.1",
+    "@angular/platform-browser": "^10.1.2",
+    "@angular/platform-browser-dynamic": "^10.1.2",
+    "@angular/router": "^10.1.2",
+    "moment": "^2.28.0",
+    "rxjs": "^6.6.3",
+    "rxjs-compat": "^6.6.3",
     "tslib": "^2.0.0",
     "zone.js": "~0.10.2"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "^0.1000.5",
-    "@angular/cli": "^10.0.5",
-    "@angular/compiler-cli": "^10.0.8",
-    "@angular/language-service": "^10.0.8",
-    "@types/jasmine": "^3.5.10",
+    "@angular-devkit/build-angular": "^0.1000.8",
+    "@angular/cli": "^10.1.2",
+    "@angular/compiler-cli": "^10.1.2",
+    "@angular/language-service": "^10.1.2",
+    "@types/jasmine": "^3.5.14",
     "@types/jasminewd2": "~2.0.8",
-    "@types/node": "^12.12.47",
+    "@types/node": "^12.12.62",
     "codelyzer": "^6.0.0",
     "jasmine-core": "~3.5.0",
     "jasmine-spec-reporter": "~5.0.0",
diff --git a/pdb-js/src/app/plot.service.ts b/pdb-js/src/app/plot.service.ts
index 9f93370..a11ea16 100644
--- a/pdb-js/src/app/plot.service.ts
+++ b/pdb-js/src/app/plot.service.ts
@@ -202,6 +202,7 @@ export class PlotRequest {
   generateThumbnail : boolean;
   intervalUnit: string;
   intervalValue: number;
+  renderBarChartTickLabels: boolean = false;
   
   copy(): PlotRequest {
     return JSON.parse(JSON.stringify(this));
diff --git a/pdb-js/src/app/visualization-page/visualization-page.component.html b/pdb-js/src/app/visualization-page/visualization-page.component.html
index 5aaad68..cd209a7 100644
--- a/pdb-js/src/app/visualization-page/visualization-page.component.html
+++ b/pdb-js/src/app/visualization-page/visualization-page.component.html
@@ -36,6 +36,7 @@
         <mat-label>Intervals (only bar chart):</mat-label>
         <mat-select [(value)]="intervalUnit">
           <mat-option value="NO_INTERVAL">-</mat-option>
+          <mat-option value="SECOND">second</mat-option>
           <mat-option value="MINUTE">minute</mat-option>
           <mat-option value="HOUR">hour</mat-option>
           <mat-option value="DAY">day</mat-option>
@@ -45,6 +46,9 @@
         </mat-select>
       </mat-form-field>
       </div>
+      <div [hidden]="!selectedPlotTypesContains('BAR')">
+        <mat-checkbox [(ngModel)]="renderBarChartTickLabels">Show Tic Labels (bar chart)</mat-checkbox>
+      </div>
      <pdb-y-axis-definition #y1AxisDefinitionComponent yIndex="1"></pdb-y-axis-definition>
      <pdb-y-axis-definition #y2AxisDefinitionComponent yIndex="2" [hidden]="!y2AxisAvailable"></pdb-y-axis-definition>
      
diff --git a/pdb-js/src/app/visualization-page/visualization-page.component.ts b/pdb-js/src/app/visualization-page/visualization-page.component.ts
index 75eefdc..13fc208 100644
--- a/pdb-js/src/app/visualization-page/visualization-page.component.ts
+++ b/pdb-js/src/app/visualization-page/visualization-page.component.ts
@@ -53,6 +53,7 @@ export class VisualizationPageComponent implements OnInit {
   
   intervalUnit = 'NO_INTERVAL';
   intervalValue = 1;
+  renderBarChartTickLabels = false;
 
   constructor(private plotService: PlotService, private snackBar: MatSnackBar) {
   }
@@ -172,6 +173,7 @@ export class VisualizationPageComponent implements OnInit {
     request.generateThumbnail = this.enableGallery;
     request.intervalUnit = this.intervalUnit;
     request.intervalValue = this.intervalValue;
+    request.renderBarChartTickLabels = this.renderBarChartTickLabels;
     return request;
   }
   
diff --git a/pdb-js/src/app/y-axis-definition/y-axis-definition.component.ts b/pdb-js/src/app/y-axis-definition/y-axis-definition.component.ts
index 5307b05..d05fbf8 100644
--- a/pdb-js/src/app/y-axis-definition/y-axis-definition.component.ts
+++ b/pdb-js/src/app/y-axis-definition/y-axis-definition.component.ts
@@ -9,7 +9,7 @@ import { YAxisDefinition  } from '../plot.service';
 export class YAxisDefinitionComponent {
 
   yAxisScale: string = "LOG10";
-  yAxisUnit: string = "SECONDS";
+  yAxisUnit: string = "MINUTES";
   minYValue: number = 0;
   maxYValue: number = 300;
   
diff --git a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregator.java b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregator.java
index d2132d8..447b8e6 100644
--- a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregator.java
+++ b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregator.java
@@ -82,7 +82,7 @@ public class BarChartAggregator implements CustomAggregator, IndexedAggregator,
 
     @Override
     public String renderLabels(final GnuplotAxis xAxis) {
-        return String.format("set label at %s %f, %d '%s' center front offset 0,0.3", // front
+        return String.format(Locale.US, "set label at %s %f, %d '%s' center front offset 0,0.3", // front
                 xAxis == GnuplotAxis.X1 ? "first" : "second", //
                 getIndex() + 0.5, //
                 getCount(), //
diff --git a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregatorForIntervals.java b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregatorForIntervals.java
index 2dba195..e3cd661 100644
--- a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregatorForIntervals.java
+++ b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartAggregatorForIntervals.java
@@ -8,6 +8,7 @@ import java.util.UUID;
 import java.util.concurrent.atomic.AtomicLong;
 
 import org.lucares.recommind.logs.GnuplotAxis;
+import org.lucares.recommind.logs.GnuplotSettings;
 
 public class BarChartAggregatorForIntervals implements CustomAggregator, IndexedAggregator, BarChart {
 
@@ -24,8 +25,11 @@ public class BarChartAggregatorForIntervals implements CustomAggregator, Indexed
 
     private int count;
 
-    public BarChartAggregatorForIntervals(final Interval interval) {
-        this.interval = interval;
+    private final PlotSettings settings;
+
+    public BarChartAggregatorForIntervals(final PlotSettings settings) {
+        this.settings = settings;
+        this.interval = settings.getInterval().get();
         buckets = interval.getBuckets();
     }
 
@@ -72,20 +76,35 @@ public class BarChartAggregatorForIntervals implements CustomAggregator, Indexed
         final StringBuilder csv = new StringBuilder();
         final boolean isMiddleSeries = getIndex() == numberOfDataSeries / 2;
 
+        int i = 0;
         int offset = 0;
         for (final String bucketId : bucketIds()) {
             final long count = buckets.get(bucketId).get();
             csv.append(String.format(Locale.US, "%f", offset + getIndex() * SPACE_BETWEEN_BARS + 0.5));
             csv.append(",");
-            csv.append(renderLabels && isMiddleSeries ? bucketId : "");
+            csv.append(renderLabels && isMiddleSeries && showLabel(i, buckets.size()) ? bucketId : "");
             csv.append(",");
             csv.append(count);
             csv.append("\n");
             offset += numberOfDataSeries;
+            i++;
         }
         return csv.toString();
     }
 
+    private boolean showLabel(final int index, final int numberOfBuckets) {
+        final int width = settings.getWidth();
+        final int widthInPx = width - GnuplotSettings.GNUPLOT_LEFT_RIGHT_MARGIN;
+
+        final long maxLabels = Math.max(1, widthInPx / (GnuplotSettings.TICKS_FONT_SIZE * 8));
+
+        if (maxLabels >= numberOfBuckets) {
+            return true;
+        } else {
+            return index % (int) Math.ceil(numberOfBuckets / (double) maxLabels) == 0;
+        }
+    }
+
     private SortedSet<String> bucketIds() {
 
         return new TreeSet<>(buckets.keySet());
diff --git a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartHandler.java b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartHandler.java
index 8779dad..dd25e02 100644
--- a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartHandler.java
+++ b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/BarChartHandler.java
@@ -56,7 +56,7 @@ public class BarChartHandler extends AggregateHandler {
         appendln(result, barAggregator.asCsv(settings.isRenderLabels()));
         appendln(result, "EOD");
 
-        if (settings.isRenderLabels()) {
+        if (settings.isRenderLabels() && settings.isRenderBarChartTickLabels()) {
             appendfln(result, barAggregator.renderLabels(getxAxis()));
         }
 
@@ -82,7 +82,7 @@ public class BarChartHandler extends AggregateHandler {
     CustomAggregator createCustomAggregator(final Path tmpDir, final PlotSettings plotSettings,
             final long fromEpochMilli, final long toEpochMilli) {
         if (plotSettings.getInterval().isPresent()) {
-            return new BarChartAggregatorForIntervals(plotSettings.getInterval().get());
+            return new BarChartAggregatorForIntervals(plotSettings);
         } else {
             return new BarChartAggregator();
         }
diff --git a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/Interval.java b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/Interval.java
index ba83834..1e45139 100644
--- a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/Interval.java
+++ b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/Interval.java
@@ -1,6 +1,5 @@
 package org.lucares.pdb.plot.api;
 
-import java.time.temporal.ChronoUnit;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -10,38 +9,6 @@ import org.lucares.pdb.api.DateTimeRange;
 import org.lucares.utils.LongToDateBucket;
 
 public class Interval {
-    public enum IntervalTimeUnit {
-        MINUTE, HOUR, DAY, WEEK, MONTH, YEAR;
-
-        public static boolean isValid(final String value) {
-            for (final IntervalTimeUnit e : values()) {
-                if (e.name().equals(value)) {
-                    return true;
-                }
-            }
-            return false;
-        }
-
-        public ChronoUnit toChronoUnit() {
-            switch (this) {
-            case MINUTE:
-                return ChronoUnit.MINUTES;
-            case HOUR:
-                return ChronoUnit.HOURS;
-            case DAY:
-                return ChronoUnit.DAYS;
-            case WEEK:
-                return ChronoUnit.WEEKS;
-            case MONTH:
-                return ChronoUnit.MONTHS;
-            case YEAR:
-                return ChronoUnit.YEARS;
-            default:
-                throw new IllegalArgumentException("Unexpected value: " + this);
-            }
-        }
-    }
-
     private final IntervalTimeUnit intervalTimeUnit;
 
     private final int value;
@@ -61,10 +28,12 @@ public class Interval {
 
     private String toDateFormatForBucketer(final IntervalTimeUnit intervalTimeUnit) {
         switch (intervalTimeUnit) {
+        case SECOND:
+            return "yyyy-MM-dd'\\n'HH:mm:ss";
         case MINUTE:
-            return "yyyy-MM-dd HH:mm";
+            return "yyyy-MM-dd'\\n'HH:mm";
         case HOUR:
-            return "yyyy-MM-dd HH";
+            return "yyyy-MM-dd'\\n'HH:00";
         case DAY:
             return "yyyy-MM-dd";
         case WEEK:
diff --git a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/IntervalTimeUnit.java b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/IntervalTimeUnit.java
new file mode 100644
index 0000000..d8cd732
--- /dev/null
+++ b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/IntervalTimeUnit.java
@@ -0,0 +1,37 @@
+package org.lucares.pdb.plot.api;
+
+import org.lucares.utils.DateBucketUnit;
+
+public enum IntervalTimeUnit {
+    SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, YEAR;
+
+    public static boolean isValid(final String value) {
+        for (final IntervalTimeUnit e : values()) {
+            if (e.name().equals(value)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public DateBucketUnit toChronoUnit() {
+        switch (this) {
+        case SECOND:
+            return DateBucketUnit.SECOND;
+        case MINUTE:
+            return DateBucketUnit.MINUTE;
+        case HOUR:
+            return DateBucketUnit.HOUR;
+        case DAY:
+            return DateBucketUnit.DAY;
+        case WEEK:
+            return DateBucketUnit.WEEK;
+        case MONTH:
+            return DateBucketUnit.MONTH;
+        case YEAR:
+            return DateBucketUnit.YEAR;
+        default:
+            throw new IllegalArgumentException("Unexpected value: " + this);
+        }
+    }
+}
\ No newline at end of file
diff --git a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/PlotSettings.java b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/PlotSettings.java
index 4b1552f..e0e22ce 100644
--- a/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/PlotSettings.java
+++ b/pdb-plotting/src/main/java/org/lucares/pdb/plot/api/PlotSettings.java
@@ -45,6 +45,8 @@ public class PlotSettings {
 
     private Interval interval;
 
+    private boolean renderBarChartTickLabels;
+
     public String getQuery() {
         return query;
     }
@@ -197,4 +199,12 @@ public class PlotSettings {
         this.interval = interval;
     }
 
+    public boolean isRenderBarChartTickLabels() {
+        return renderBarChartTickLabels;
+    }
+
+    public void setRenderBarChartTickLabels(final boolean renderBarChartTickLabels) {
+        this.renderBarChartTickLabels = renderBarChartTickLabels;
+    }
+
 }
diff --git a/pdb-plotting/src/main/java/org/lucares/recommind/logs/GnuplotSettings.java b/pdb-plotting/src/main/java/org/lucares/recommind/logs/GnuplotSettings.java
index 6a53893..d12e35f 100644
--- a/pdb-plotting/src/main/java/org/lucares/recommind/logs/GnuplotSettings.java
+++ b/pdb-plotting/src/main/java/org/lucares/recommind/logs/GnuplotSettings.java
@@ -35,6 +35,7 @@ public class GnuplotSettings {
     private AxisSettings xAxisSettings = new AxisSettings();
     private boolean renderLabels = true;
     private DateTimeRange dateTimeRange;
+    private boolean renderBarChartTickLabels;
 
     public GnuplotSettings(final Path output) {
         this.output = output;
@@ -151,6 +152,14 @@ public class GnuplotSettings {
         }
     }
 
+    public boolean isRenderBarChartTickLabels() {
+        return renderBarChartTickLabels;
+    }
+
+    public void setRenderBarChartTickLabels(final boolean renderBarChartTickLabels) {
+        this.renderBarChartTickLabels = renderBarChartTickLabels;
+    }
+
     // plot 'sample.txt' using 1:2 title 'Bytes' with linespoints 2
 
 }
diff --git a/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java b/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java
index a6cec0f..1c62c63 100644
--- a/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java
+++ b/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java
@@ -113,6 +113,7 @@ public class Plotter {
 
                 gnuplotSettings.setAggregates(plotSettings.getAggregates());
                 gnuplotSettings.setKeyOutside(plotSettings.isKeyOutside());
+                gnuplotSettings.setRenderBarChartTickLabels(plotSettings.isRenderBarChartTickLabels());
                 gnuplot.plot(gnuplotSettings, dataSeries);
             }
 
diff --git a/pdb-ui/build.gradle b/pdb-ui/build.gradle
index 79c40a1..9a99013 100644
--- a/pdb-ui/build.gradle
+++ b/pdb-ui/build.gradle
@@ -26,6 +26,7 @@ dependencies {
 	testImplementation(lib_spring_boot_test){
 		exclude module: 'spring-boot-starter-logging'
 		exclude module: 'junit'
+    exclude module: 'junit-vintage-engine'
 	}
 }
 
diff --git a/pdb-ui/src/main/java/org/lucares/pdbui/PlotSettingsTransformer.java b/pdb-ui/src/main/java/org/lucares/pdbui/PlotSettingsTransformer.java
index 8f3bf08..da47781 100644
--- a/pdb-ui/src/main/java/org/lucares/pdbui/PlotSettingsTransformer.java
+++ b/pdb-ui/src/main/java/org/lucares/pdbui/PlotSettingsTransformer.java
@@ -35,6 +35,7 @@ class PlotSettingsTransformer {
         result.setY2(request.getY2());
         result.setAggregates(toAggregateInternal(request.getY1(), request.getY2(), request.getAggregates()));
         result.setInterval(Interval.create(request.getIntervalUnit(), request.getIntervalValue(), result.dateRange()));
+        result.setRenderBarChartTickLabels(request.isRenderBarChartTickLabels());
 
         return result;
     }
diff --git a/pdb-ui/src/main/java/org/lucares/pdbui/domain/PlotRequest.java b/pdb-ui/src/main/java/org/lucares/pdbui/domain/PlotRequest.java
index d4d8a8c..aa55c8c 100644
--- a/pdb-ui/src/main/java/org/lucares/pdbui/domain/PlotRequest.java
+++ b/pdb-ui/src/main/java/org/lucares/pdbui/domain/PlotRequest.java
@@ -37,6 +37,8 @@ public class PlotRequest {
     private String intervalUnit;
     private int intervalValue;
 
+    private boolean renderBarChartTickLabels;
+
     public String getQuery() {
         return query;
     }
@@ -169,4 +171,12 @@ public class PlotRequest {
     public void setIntervalValue(final int intervalValue) {
         this.intervalValue = intervalValue;
     }
+
+    public boolean isRenderBarChartTickLabels() {
+        return renderBarChartTickLabels;
+    }
+
+    public void setRenderBarChartTickLabels(final boolean renderBarChartTickLabels) {
+        this.renderBarChartTickLabels = renderBarChartTickLabels;
+    }
 }
diff --git a/pdb-ui/src/main/resources/log4j2.xml b/pdb-ui/src/main/resources/log4j2.xml
index 7fa98f9..637de31 100644
--- a/pdb-ui/src/main/resources/log4j2.xml
+++ b/pdb-ui/src/main/resources/log4j2.xml
@@ -44,9 +44,9 @@
     <logger name="org.lucares.metrics.plotter" level="DEBUG" />
     <logger name="org.lucares.metrics.gnuplot" level="DEBUG" />
     <logger name="org.lucares.metrics.aggregator.parallelRequests" level="DEBUG" />
+    <logger name="org.lucares.metrics.dataStore" level="DEBUG" />
     <!-- 
     <logger name="org.lucares.metrics.ingestion.tagsToFile.newPdbWriter" level="DEBUG" />
-    <logger name="org.lucares.metrics.dataStore" level="DEBUG" />
     <logger name="org.lucares.pdb.datastore.lang.QueryCompletionPdbLangParser" level="TRACE" />
     <logger name="org.lucares.pdb.datastore.lang.ExpressionToDocIdVisitor" level="TRACE" />
      -->
diff --git a/pdb-ui/src/test/java/org/lucares/pdbui/date/FastISODateParserTest.java b/pdb-ui/src/test/java/org/lucares/pdbui/date/FastISODateParserTest.java
index 2804e58..dc65501 100644
--- a/pdb-ui/src/test/java/org/lucares/pdbui/date/FastISODateParserTest.java
+++ b/pdb-ui/src/test/java/org/lucares/pdbui/date/FastISODateParserTest.java
@@ -44,8 +44,7 @@ public class FastISODateParserTest {
                 Arguments.of("2018-11-18T14:55:49.Z"), //
                 Arguments.of("2018-11-18T14:55:49.-01:23"), //
                 Arguments.of("2018-11-18T14:55:49Z"), //
-                Arguments.of("2018-11-18T14:55:49-01:23"), //
-                Arguments.of("2018-11-18 14:55:49,123") //
+                Arguments.of("2018-11-18T14:55:49-01:23") //
         );
 
     }
@@ -76,7 +75,8 @@ public class FastISODateParserTest {
                 Arguments.of("2018-11-18T14:42:49,123+12:34", "2018-11-18T14:42:49.123+12:34"), // with comma instead of
                                                                                                 // dot
                 Arguments.of("2018-11-18T14:42:49.123", "2018-11-18T14:42:49.123Z"), // without timezone
-                Arguments.of("2018-11-18T14:42:49,123", "2018-11-18T14:42:49.123Z") // with command, without timezone
+                Arguments.of("2018-11-18T14:42:49,123", "2018-11-18T14:42:49.123Z"), // with command, without timezone
+                Arguments.of("2018-11-18 14:42:49,123", "2018-11-18T14:42:49.123Z") // without the 'T'
         );
     }
 
diff --git a/pdb-utils/src/main/java/org/lucares/utils/BeginningOfNextInterval.java b/pdb-utils/src/main/java/org/lucares/utils/BeginningOfNextInterval.java
index 7029975..d039c2e 100644
--- a/pdb-utils/src/main/java/org/lucares/utils/BeginningOfNextInterval.java
+++ b/pdb-utils/src/main/java/org/lucares/utils/BeginningOfNextInterval.java
@@ -6,9 +6,9 @@ import java.time.temporal.TemporalAdjuster;
 
 public class BeginningOfNextInterval implements TemporalAdjuster {
 
-    private final ChronoUnit unit;
+    private final DateBucketUnit unit;
 
-    public BeginningOfNextInterval(final ChronoUnit unit) {
+    public BeginningOfNextInterval(final DateBucketUnit unit) {
         this.unit = unit;
     }
 
@@ -19,27 +19,31 @@ public class BeginningOfNextInterval implements TemporalAdjuster {
         result = result.with(startOfInterval);
 
         switch (unit) {
-        case MINUTES: {
+        case SECOND: {
+            result = result.plus(1, ChronoUnit.SECONDS);
+            break;
+        }
+        case MINUTE: {
             result = result.plus(1, ChronoUnit.MINUTES);
             break;
         }
-        case HOURS: {
+        case HOUR: {
             result = result.plus(1, ChronoUnit.HOURS);
             break;
         }
-        case DAYS: {
+        case DAY: {
             result = result.plus(1, ChronoUnit.DAYS);
             break;
         }
-        case WEEKS: {
+        case WEEK: {
             result = result.plus(1, ChronoUnit.WEEKS);
             break;
         }
-        case MONTHS: {
+        case MONTH: {
             result = result.plus(1, ChronoUnit.MONTHS);
             break;
         }
-        case YEARS: {
+        case YEAR: {
             result = result.plus(1, ChronoUnit.YEARS);
             break;
         }
diff --git a/pdb-utils/src/main/java/org/lucares/utils/DateBucketUnit.java b/pdb-utils/src/main/java/org/lucares/utils/DateBucketUnit.java
new file mode 100644
index 0000000..a9ce487
--- /dev/null
+++ b/pdb-utils/src/main/java/org/lucares/utils/DateBucketUnit.java
@@ -0,0 +1,5 @@
+package org.lucares.utils;
+
+public enum DateBucketUnit {
+    SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, YEAR;
+}
diff --git a/pdb-utils/src/main/java/org/lucares/utils/EndOfInterval.java b/pdb-utils/src/main/java/org/lucares/utils/EndOfInterval.java
index 14f7147..c610b92 100644
--- a/pdb-utils/src/main/java/org/lucares/utils/EndOfInterval.java
+++ b/pdb-utils/src/main/java/org/lucares/utils/EndOfInterval.java
@@ -6,9 +6,9 @@ import java.time.temporal.TemporalAdjuster;
 
 public class EndOfInterval implements TemporalAdjuster {
 
-    private final ChronoUnit unit;
+    private final DateBucketUnit unit;
 
-    public EndOfInterval(final ChronoUnit unit) {
+    public EndOfInterval(final DateBucketUnit unit) {
         this.unit = unit;
     }
 
diff --git a/pdb-utils/src/main/java/org/lucares/utils/LongToDateBucket.java b/pdb-utils/src/main/java/org/lucares/utils/LongToDateBucket.java
index f350ea1..2ef0778 100644
--- a/pdb-utils/src/main/java/org/lucares/utils/LongToDateBucket.java
+++ b/pdb-utils/src/main/java/org/lucares/utils/LongToDateBucket.java
@@ -4,7 +4,6 @@ import java.time.Instant;
 import java.time.OffsetDateTime;
 import java.time.ZoneOffset;
 import java.time.format.DateTimeFormatter;
-import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map.Entry;
@@ -55,14 +54,14 @@ public class LongToDateBucket {
      */
     private final DateTimeFormatter datePattern;
 
-    ChronoUnit chronoUnit;
+    DateBucketUnit chronoUnit;
 
     // visible for test
     final ConcurrentNavigableMap<Long, DatePrefixAndRange> datePrefixCache = new ConcurrentSkipListMap<>();
 
     private final AtomicReference<DatePrefixAndRange> lastAccessed = new AtomicReference<>(null);
 
-    public LongToDateBucket(final String dateFormatPattern, final ChronoUnit chronoUnit) {
+    public LongToDateBucket(final String dateFormatPattern, final DateBucketUnit chronoUnit) {
         this.chronoUnit = chronoUnit;
         this.datePattern = DateTimeFormatter.ofPattern(dateFormatPattern);
     }
@@ -118,7 +117,7 @@ public class LongToDateBucket {
      * @return
      */
     public List<String> toPartitionIds(final OffsetDateTime start, final OffsetDateTime end,
-            final ChronoUnit chronoUnit) {
+            final DateBucketUnit chronoUnit) {
         final List<String> result = new ArrayList<>();
 
         OffsetDateTime current = start;
diff --git a/pdb-utils/src/main/java/org/lucares/utils/StartOfInterval.java b/pdb-utils/src/main/java/org/lucares/utils/StartOfInterval.java
index 63e82ab..dfca56b 100644
--- a/pdb-utils/src/main/java/org/lucares/utils/StartOfInterval.java
+++ b/pdb-utils/src/main/java/org/lucares/utils/StartOfInterval.java
@@ -1,75 +1,69 @@
 package org.lucares.utils;
 
 import java.time.temporal.ChronoField;
-import java.time.temporal.ChronoUnit;
 import java.time.temporal.Temporal;
 import java.time.temporal.TemporalAdjuster;
 
 public class StartOfInterval implements TemporalAdjuster {
 
-    private final ChronoUnit unit;
+    private final DateBucketUnit unit;
 
-    public StartOfInterval(final ChronoUnit unit) {
+    public StartOfInterval(final DateBucketUnit unit) {
         this.unit = unit;
     }
 
     @Override
     public Temporal adjustInto(final Temporal temporal) {
         Temporal result = temporal;
-        for (final ChronoUnit chronoUnit : ChronoUnit.values()) {
-            if (chronoUnit.compareTo(unit) >= 0) {
+        result = result.with(ChronoField.NANO_OF_SECOND, 0);
+        result = result.with(ChronoField.MICRO_OF_SECOND, 0);
+        result = result.with(ChronoField.MILLI_OF_SECOND, 0);
+
+        for (final DateBucketUnit dateBucketUnit : DateBucketUnit.values()) {
+            if (dateBucketUnit.compareTo(unit) >= 0) {
                 break;
             }
 
-            switch (chronoUnit) {
-            case NANOS: {
-                result = result.with(ChronoField.NANO_OF_SECOND, 0);
-                break;
-            }
-            case MICROS: {
-                result = result.with(ChronoField.MICRO_OF_SECOND, 0);
-                break;
-            }
-            case MILLIS: {
-                result = result.with(ChronoField.MILLI_OF_SECOND, 0);
-                break;
-            }
-            case SECONDS: {
+            switch (dateBucketUnit) {
+            case SECOND: {
                 result = result.with(ChronoField.SECOND_OF_MINUTE, 0);
                 break;
             }
-            case MINUTES: {
+            case MINUTE: {
                 result = result.with(ChronoField.MINUTE_OF_HOUR, 0);
                 break;
             }
-            case HOURS: {
+            case HOUR: {
                 result = result.with(ChronoField.HOUR_OF_DAY, 0);
                 break;
             }
-            case DAYS: {
+            case DAY: {
                 switch (unit) {
-                case WEEKS: {
+                case WEEK: {
                     result = result.with(ChronoField.DAY_OF_WEEK, 1);
                     break;
                 }
-                case MONTHS: {
+                case MONTH: {
                     result = result.with(ChronoField.DAY_OF_MONTH, 1);
                     break;
                 }
+                case YEAR: {
+                    result = result.with(ChronoField.MONTH_OF_YEAR, 1);
+                    break;
+                }
                 default:
                     throw new IllegalArgumentException("Unexpected value: " + unit);
                 }
                 break;
             }
-            case MONTHS: {
+            case MONTH: {
                 result = result.with(ChronoField.MONTH_OF_YEAR, 1);
                 break;
             }
-            case HALF_DAYS:
-            case WEEKS:
+            case WEEK:
                 break;
             default:
-                throw new IllegalArgumentException("Unexpected value: " + chronoUnit);
+                throw new IllegalArgumentException("Unexpected value: " + dateBucketUnit);
             }
         }
 
diff --git a/pdb-utils/src/main/java/org/lucares/utils/cache/RuntimeExcecutionException.java b/pdb-utils/src/main/java/org/lucares/utils/cache/RuntimeExcecutionException.java
deleted file mode 100644
index c3088a0..0000000
--- a/pdb-utils/src/main/java/org/lucares/utils/cache/RuntimeExcecutionException.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package org.lucares.utils.cache;
-
-import java.util.concurrent.ExecutionException;
-
-public class RuntimeExcecutionException extends RuntimeException {
-
-    private static final long serialVersionUID = -3626851728980513527L;
-
-    public RuntimeExcecutionException(final ExecutionException e) {
-        super(e);
-    }
-
-}
diff --git a/pdb-utils/src/test/java/org/lucares/utils/LongToDateBucketTest.java b/pdb-utils/src/test/java/org/lucares/utils/LongToDateBucketTest.java
index 495c62a..a3172d3 100644
--- a/pdb-utils/src/test/java/org/lucares/utils/LongToDateBucketTest.java
+++ b/pdb-utils/src/test/java/org/lucares/utils/LongToDateBucketTest.java
@@ -2,7 +2,6 @@ package org.lucares.utils;
 
 import java.time.OffsetDateTime;
 import java.time.ZoneOffset;
-import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.DoubleSummaryStatistics;
@@ -49,61 +48,42 @@ public class LongToDateBucketTest {
     @MethodSource("provider")
     public void test(final OffsetDateTime start, final OffsetDateTime end, final Set<String> expected) {
 
-        final Set<String> actual = new LongToDateBucket("yyyyMM", ChronoUnit.MONTHS).toDateIndexPrefix(start, end);
+        final Set<String> actual = new LongToDateBucket("yyyyMM", DateBucketUnit.MONTH).toDateIndexPrefix(start, end);
 
         Assertions.assertEquals(expected, actual);
     }
 
-//    @Test
-//    public void testDateToDateIndexPrefix() {
-//
-//        final long mid_201711 = OffsetDateTime.of(2017, 11, 23, 2, 2, 2, 0, ZoneOffset.UTC).toInstant().toEpochMilli();
-//        final long mid_201712 = OffsetDateTime.of(2017, 12, 7, 1, 1, 1, 0, ZoneOffset.UTC).toInstant().toEpochMilli();
-//        final long min_201801 = OffsetDateTime.of(2018, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC).toInstant().toEpochMilli();
-//        final long max_201801 = OffsetDateTime.of(2018, 1, 31, 23, 59, 59, 999_999_999, ZoneOffset.UTC).toInstant()
-//                .toEpochMilli();
-//        final LongToDateBucket longToDateBucket = new LongToDateBucket("yyyyMM");
-//
-//        Assertions.assertEquals("201712", longToDateBucket.toDateIndexPrefix(mid_201712));
-//        Assertions.assertEquals("201801", longToDateBucket.toDateIndexPrefix(min_201801));
-//        Assertions.assertEquals("201801", longToDateBucket.toDateIndexPrefix(max_201801));
-//        Assertions.assertEquals("201711", longToDateBucket.toDateIndexPrefix(mid_201711));
-//    }
-
     @Test
     public void testDateRanges() {
-        final OffsetDateTime mid_201712 = OffsetDateTime.of(2017, 12, 7, 1, 1, 1, 0, ZoneOffset.UTC)
-                .withOffsetSameInstant(ZoneOffset.ofHours(-2));
-        final OffsetDateTime min_201801 = OffsetDateTime.of(2018, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC)
-                .withOffsetSameInstant(ZoneOffset.ofHours(-8));
-        final OffsetDateTime min_201802 = OffsetDateTime.of(2018, 2, 1, 0, 0, 0, 0, ZoneOffset.UTC)
-                .withOffsetSameInstant(ZoneOffset.ofHours(12));
+        final OffsetDateTime mid_201712 = OffsetDateTime.of(2017, 12, 7, 1, 1, 1, 0, ZoneOffset.UTC);
+        final OffsetDateTime min_201801 = OffsetDateTime.of(2018, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC);
+        final OffsetDateTime min_201802 = OffsetDateTime.of(2018, 2, 1, 0, 0, 0, 0, ZoneOffset.UTC);
 
-        final LongToDateBucket longToDateBucket = new LongToDateBucket("yyyyMM", ChronoUnit.MONTHS);
+        final LongToDateBucket longToDateBucket = new LongToDateBucket("yyyyMM", DateBucketUnit.MONTH);
 
         final List<String> dateIndexPrefixesWithEmptyCache = longToDateBucket.toPartitionIds(mid_201712, min_201802,
-                ChronoUnit.MONTHS);
+                DateBucketUnit.MONTH);
         Assertions.assertEquals(Arrays.asList("201712", "201801", "201802"), dateIndexPrefixesWithEmptyCache);
 
         final List<String> dateIndexPrefixesWithFilledCache = longToDateBucket.toPartitionIds(mid_201712, min_201801,
-                ChronoUnit.MONTHS);
+                DateBucketUnit.MONTH);
         Assertions.assertEquals(Arrays.asList("201712", "201801"), dateIndexPrefixesWithFilledCache);
 
         final List<String> dateIndexPrefixesOneMonth = longToDateBucket.toPartitionIds(mid_201712, mid_201712,
-                ChronoUnit.MONTHS);
+                DateBucketUnit.MONTH);
         Assertions.assertEquals(Arrays.asList("201712"), dateIndexPrefixesOneMonth);
     }
 
     @Test
     public void testDateRangeToEpochMilli() {
-        final OffsetDateTime mid_201712 = OffsetDateTime.of(2017, 12, 7, 1, 1, 1, 0, ZoneOffset.ofHours(3));
-        final OffsetDateTime min_201802 = OffsetDateTime.of(2018, 2, 15, 0, 0, 0, 0, ZoneOffset.ofHours(7));
+        final OffsetDateTime mid_201712 = OffsetDateTime.of(2017, 12, 7, 1, 1, 1, 0, ZoneOffset.UTC);
+        final OffsetDateTime min_201802 = OffsetDateTime.of(2018, 2, 15, 0, 0, 0, 0, ZoneOffset.UTC);
 
         final long exp_201712 = OffsetDateTime.of(2017, 12, 1, 0, 0, 0, 0, ZoneOffset.UTC).toInstant().toEpochMilli();
         final long exp_201801 = OffsetDateTime.of(2018, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC).toInstant().toEpochMilli();
         final long exp_201802 = OffsetDateTime.of(2018, 2, 1, 0, 0, 0, 0, ZoneOffset.UTC).toInstant().toEpochMilli();
 
-        final LongToDateBucket longToDateBucket = new LongToDateBucket("yyyyMM", ChronoUnit.MONTHS);
+        final LongToDateBucket longToDateBucket = new LongToDateBucket("yyyyMM", DateBucketUnit.MONTH);
 
         final List<Long> dateIndexEpochMillis = longToDateBucket.toDateIndexEpochMillis(mid_201712, min_201802);
         Assertions.assertEquals(Arrays.asList(exp_201712, exp_201801, exp_201802), dateIndexEpochMillis);
@@ -121,7 +101,7 @@ public class LongToDateBucketTest {
         final int warmup = 20 * factor;
         final int rounds = warmup + 20;
 
-        final LongToDateBucket longToDateBucket = new LongToDateBucket("yyyyMM", ChronoUnit.MONTHS);
+        final LongToDateBucket longToDateBucket = new LongToDateBucket("yyyyMM", DateBucketUnit.MONTH);
 
         // fill the cache
         for (long i = min; i < max; i += 3600 * 24 * 28) {