diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/tr/column/PeriodDataType.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/tr/column/PeriodDataType.java
index 3f1067b..f004427 100644
--- a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/tr/column/PeriodDataType.java
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/tr/column/PeriodDataType.java
@@ -16,18 +16,26 @@ public enum PeriodDataType {
 	DAY("Day"), 
 	MONTH("Month"),  
 	QUARTER("Quarter_of_year"),  
-	YEAR("Year");
-	
+	YEAR("Year"),
+	DECADE("Decade"),
+	CENTURY("Century");
 	
 	private static Map<PeriodDataType, List<PeriodDataType>> hierarchicalRelation = new HashMap<PeriodDataType, List<PeriodDataType>>();
 	
 	static {
-		hierarchicalRelation.put(DAY, Arrays.asList(MONTH, QUARTER, YEAR));
-		hierarchicalRelation.put(MONTH, Arrays.asList(QUARTER, YEAR));
-		hierarchicalRelation.put(QUARTER, Arrays.asList(YEAR));
+		hierarchicalRelation.put(DAY, Arrays.asList(MONTH, QUARTER, YEAR, DECADE, CENTURY));
+		hierarchicalRelation.put(MONTH, Arrays.asList(QUARTER, YEAR, DECADE, CENTURY));
+		hierarchicalRelation.put(QUARTER, Arrays.asList(YEAR, DECADE, CENTURY));
+		hierarchicalRelation.put(YEAR, Arrays.asList(DECADE, CENTURY));
+		hierarchicalRelation.put(DECADE, Arrays.asList(CENTURY));
 	}
 	
 	
+	
+	private static final int START_YEAR = 1700;
+	
+	private static final int END_YEAR = 2300;
+	
 	/**
 	 * @param text
 	 */
@@ -60,10 +68,52 @@ public enum PeriodDataType {
 			return "Quarter of year";
 		case YEAR:
 			return "Year";
+		case DECADE:
+			return "Decade";
+		case CENTURY:
+			return "Century";
 		default:
 			return null;
 		}
 		
 	}
+	
+	public static int getStartYear(){
+		return START_YEAR;
+	}
+	
+	public static int getEndYear(){
+		return END_YEAR;
+	}
+	
+	
+	public static PeriodDataType getPeriodFromString(String period){
+		if(period.compareToIgnoreCase(PeriodDataType.DAY.toString())==0){
+			return PeriodDataType.DAY;
+		} else {
+			if(period.compareToIgnoreCase(PeriodDataType.MONTH.toString())==0){
+				return PeriodDataType.MONTH;
+			} else {
+				if(period.compareToIgnoreCase(PeriodDataType.QUARTER.toString())==0){
+					return PeriodDataType.QUARTER;
+				} else {
+					if(period.compareToIgnoreCase(PeriodDataType.YEAR.toString())==0){
+						return PeriodDataType.YEAR;
+					} else {
+						if(period.compareToIgnoreCase(PeriodDataType.DECADE.toString())==0){
+							return PeriodDataType.DECADE;
+						} else {
+							if(period.compareToIgnoreCase(PeriodDataType.CENTURY.toString())==0){
+								return PeriodDataType.CENTURY;
+							} else {
+								return null;	
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+	
 
 }
diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/tr/column/TimeDimensionType.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/tr/column/TimeDimensionType.java
deleted file mode 100644
index 7ab6d68..0000000
--- a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/tr/column/TimeDimensionType.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package org.gcube.portlets.user.td.widgetcommonevent.shared.tr.column;
-
-public enum TimeDimensionType {
-	Day("Day"), 
-	Month("Month"), 
-	Quarter("Quarter of year"), 
-	Year("Year");
-	
-	/**
-	 * 
-	 * @param id
-	 */
-	private TimeDimensionType(final String time) {
-		this.time = time;
-	}
-
-	private final String time;
-	
-	@Override
-	public String toString() {
-		return time;
-	}
-}