cluster the indices

pdb-api/src/main/java/org/lucares/pdb/api/DateTimeRange.java

@@ -2,11 +2,16 @@ package org.lucares.pdb.api;
 
 import java.time.Duration;
 import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
 import java.time.temporal.ChronoUnit;
 import java.time.temporal.TemporalUnit;
 
 public class DateTimeRange {
 
+	private static final DateTimeRange MAX = new DateTimeRange(
+			OffsetDateTime.of(1900, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC),
+			OffsetDateTime.of(2100, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC));
+
 	private final OffsetDateTime start;
 	private final OffsetDateTime end;
 
@@ -15,6 +20,10 @@ public class DateTimeRange {
 		this.end = end;
 	}
 
+	public static DateTimeRange max() {
+		return MAX;
+	}
+
 	public static DateTimeRange now() {
 		return relativeMillis(0);
 	}
@@ -101,5 +110,4 @@ public class DateTimeRange {
 				|| timeRange.inRange(start)//
 				|| timeRange.inRange(end);
 	}
-
 }