make it possible to specify the time in the range

pdb-ui/src/main/java/org/lucares/pdbui/PdbController.java

@@ -2,9 +2,13 @@ package org.lucares.pdbui;
 
 import java.io.File;
 import java.nio.file.Path;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import org.lucares.ludb.FieldNotExistsException;
 import org.lucares.ludb.Proposal;
@@ -23,12 +27,14 @@ import org.slf4j.LoggerFactory;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.http.MediaType;
 import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.servlet.ModelAndView;
 
 @Controller
 @EnableAutoConfiguration
@@ -36,6 +42,9 @@ public class PdbController implements HardcodedValues, CollectionUtils {
 
 	private static final Logger LOGGER = LoggerFactory.getLogger(PdbController.class);
 
+	private static final DateTimeFormatter DATE_FORMAT_BEGIN = DateTimeFormatter.ofPattern("yyyy-MM-dd 00:00:00");
+	private static final DateTimeFormatter DATE_FORMAT_END = DateTimeFormatter.ofPattern("yyyy-MM-dd 23:59:59");
+
 	private final Plotter plotter;
 	private final PdbRepository db;
 
@@ -44,6 +53,15 @@ public class PdbController implements HardcodedValues, CollectionUtils {
 		this.plotter = plotter;
 	}
 
+	@GetMapping("/")
+	public ModelAndView index() {
+		final String view = "main";
+		final Map<String, Object> model = new HashMap<>();
+		model.put("oldestValue", LocalDateTime.now().minusYears(1).format(DATE_FORMAT_BEGIN));
+		model.put("latestValue", LocalDateTime.now().format(DATE_FORMAT_END));
+		return new ModelAndView(view, model);
+	}
+
 	@RequestMapping(path = "/plots", //
 			method = RequestMethod.POST, //
 			consumes = MediaType.APPLICATION_JSON_UTF8_VALUE, //