diff --git a/src/fr/devinsy/statoolinfos/core/Federation.java b/src/fr/devinsy/statoolinfos/core/Federation.java
index d68e3f4..98405c6 100644
--- a/src/fr/devinsy/statoolinfos/core/Federation.java
+++ b/src/fr/devinsy/statoolinfos/core/Federation.java
@@ -386,6 +386,23 @@ public class Federation extends PathPropertyList
         return result;
     }
 
+    /**
+     * Gets the member organizations.
+     *
+     * @param year
+     *            the year
+     * @return the member organizations
+     */
+    public Organizations getMemberOrganizations(final Year year)
+    {
+        Organizations result;
+
+        result = this.organizations.filterMemberFor(year);
+
+        //
+        return result;
+    }
+
     /**
      * Gets the metric month values all.
      *
@@ -506,6 +523,40 @@ public class Federation extends PathPropertyList
         return result;
     }
 
+    /**
+     * Gets the service count by.
+     *
+     * @param year
+     *            the year
+     * @return the service count by
+     */
+    public long getServiceCountBy(final Year year)
+    {
+        long result;
+
+        Organizations organizations = this.organizations.filterMemberFor(year);
+
+        result = 0;
+        for (Organization organization : organizations)
+        {
+            for (Service service : organization.getServices().getBy(year))
+            {
+                Year memberStart = organization.getMemberStartYear();
+                Year memberEnd = organization.getMemberEndYear();
+                Year serviceStart = service.getStartYear();
+                Year serviceEnd = service.getEndYear();
+
+                if (StatoolInfosUtils.overlapp(memberStart, memberEnd, serviceStart, serviceEnd))
+                {
+                    result += 1;
+                }
+            }
+        }
+
+        //
+        return result;
+    }
+
     /**
      * Gets the all services.
      *
diff --git a/src/fr/devinsy/statoolinfos/core/Organization.java b/src/fr/devinsy/statoolinfos/core/Organization.java
index 8d242cd..a14b993 100644
--- a/src/fr/devinsy/statoolinfos/core/Organization.java
+++ b/src/fr/devinsy/statoolinfos/core/Organization.java
@@ -501,10 +501,7 @@ public class Organization extends PathPropertyList
     {
         String result;
 
-        LocalDate startDate = StatoolInfosUtils.parseDate(getMemberStartDate());
-        LocalDate endDate = StatoolInfosUtils.parseDate(getMemberEndDate());
-
-        result = StatoolInfosUtils.toHumanDuration(startDate, endDate);
+        result = StatoolInfosUtils.toHumanDuration(getMemberStartDate(), getMemberEndDate());
 
         //
         return result;
@@ -515,7 +512,39 @@ public class Organization extends PathPropertyList
      *
      * @return the member end date
      */
-    public String getMemberEndDate()
+    public LocalDate getMemberEndDate()
+    {
+        LocalDate result;
+
+        result = getDate("organization.memberof." + this.federation.getName() + ".enddate");
+
+        //
+        return result;
+    }
+
+    /**
+     * Gets the member end date.
+     *
+     * @param entityName
+     *            the entity name
+     * @return the member end date
+     */
+    public LocalDate getMemberEndDate(final String entityName)
+    {
+        LocalDate result;
+
+        result = getDate("organization.memberof." + entityName + ".enddate");
+
+        //
+        return result;
+    }
+
+    /**
+     * Gets the member end date.
+     *
+     * @return the member end date
+     */
+    public String getMemberEndDateValue()
     {
         String result;
 
@@ -525,12 +554,67 @@ public class Organization extends PathPropertyList
         return result;
     }
 
+    /**
+     * Gets the member end year.
+     *
+     * @return the member end year
+     */
+    public Year getMemberEndYear()
+    {
+        Year result;
+
+        LocalDate date = getMemberEndDate();
+        if (date == null)
+        {
+            result = null;
+        }
+        else
+        {
+            result = Year.from(date);
+        }
+
+        //
+        return result;
+    }
+
     /**
      * Gets the member start date.
      *
      * @return the member start date
      */
-    public String getMemberStartDate()
+    public LocalDate getMemberStartDate()
+    {
+        LocalDate result;
+
+        result = getDate("organization.memberof." + this.federation.getName() + ".startdate");
+
+        //
+        return result;
+    }
+
+    /**
+     * Gets the member start date.
+     *
+     * @param entityName
+     *            the entity name
+     * @return the member start date
+     */
+    public LocalDate getMemberStartDate(final String entityName)
+    {
+        LocalDate result;
+
+        result = getDate("organization.memberof." + entityName + ".startdate");
+
+        //
+        return result;
+    }
+
+    /**
+     * Gets the member start date.
+     *
+     * @return the member start date
+     */
+    public String getMemberStartDateValue()
     {
         String result;
 
@@ -540,6 +624,29 @@ public class Organization extends PathPropertyList
         return result;
     }
 
+    /**
+     * Gets the member start year.
+     *
+     * @return the member start year
+     */
+    public Year getMemberStartYear()
+    {
+        Year result;
+
+        LocalDate date = getMemberStartDate();
+        if (date == null)
+        {
+            result = null;
+        }
+        else
+        {
+            result = Year.from(date);
+        }
+
+        //
+        return result;
+    }
+
     /**
      * Gets the status member of.
      *
@@ -1224,6 +1331,51 @@ public class Organization extends PathPropertyList
         return result;
     }
 
+    /**
+     * Checks if is member.
+     *
+     * @param year
+     *            the year
+     * @return true, if is member
+     */
+    public boolean isMember(final Year year)
+    {
+        boolean result;
+
+        if (year == null)
+        {
+            result = false;
+        }
+        else
+        {
+            Year startYear = getMemberStartYear();
+            if (startYear == null)
+            {
+                result = false;
+            }
+            else
+            {
+                Year endYear = getMemberEndYear();
+                if (endYear == null)
+                {
+                    endYear = Year.now();
+                }
+
+                if ((year.isBefore(startYear)) || (year.isAfter(endYear)))
+                {
+                    result = false;
+                }
+                else
+                {
+                    result = true;
+                }
+            }
+        }
+
+        //
+        return result;
+    }
+
     /**
      * Checks if is valid.
      *
diff --git a/src/fr/devinsy/statoolinfos/core/Organizations.java b/src/fr/devinsy/statoolinfos/core/Organizations.java
index 1f45f8c..d16cf48 100644
--- a/src/fr/devinsy/statoolinfos/core/Organizations.java
+++ b/src/fr/devinsy/statoolinfos/core/Organizations.java
@@ -18,6 +18,7 @@
  */
 package fr.devinsy.statoolinfos.core;
 
+import java.time.Year;
 import java.util.ArrayList;
 import java.util.Collections;
 
@@ -182,6 +183,31 @@ public class Organizations extends ArrayList<Organization>
         return result;
     }
 
+    /**
+     * Filter member for.
+     *
+     * @param year
+     *            the year
+     * @return the organizations
+     */
+    public Organizations filterMemberFor(final Year year)
+    {
+        Organizations result;
+
+        result = new Organizations();
+
+        for (Organization organization : this)
+        {
+            if (organization.isMember(year))
+            {
+                result.add(organization);
+            }
+        }
+
+        //
+        return result;
+    }
+
     /**
      * Gets the active service count.
      *
diff --git a/src/fr/devinsy/statoolinfos/core/Services.java b/src/fr/devinsy/statoolinfos/core/Services.java
index 6b5da8b..9e868ee 100644
--- a/src/fr/devinsy/statoolinfos/core/Services.java
+++ b/src/fr/devinsy/statoolinfos/core/Services.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020 Christian Pierre MOMON <christian@momon.org>
+ * Copyright (C) 2020-2022 Christian Pierre MOMON <christian@momon.org>
  * 
  * This file is part of StatoolInfos, simple service statistics tool.
  * 
@@ -18,6 +18,8 @@
  */
 package fr.devinsy.statoolinfos.core;
 
+import java.time.LocalDate;
+import java.time.Year;
 import java.util.ArrayList;
 import java.util.Collections;
 
@@ -40,6 +42,42 @@ public class Services extends ArrayList<Service>
         super();
     }
 
+    /**
+     * Count by year.
+     *
+     * @param year
+     *            the year
+     * @return the long
+     */
+    public long countBy(final Year year)
+    {
+        long result;
+
+        result = 0;
+        Year now = Year.now();
+        for (Service service : this)
+        {
+            Year start = service.getStartYear();
+            Year end = service.getEndYear();
+
+            if (start != null)
+            {
+                if (end == null)
+                {
+                    end = now;
+                }
+
+                if ((!start.isAfter(year) && (!end.isBefore(year))))
+                {
+                    result += 1;
+                }
+            }
+        }
+
+        //
+        return result;
+    }
+
     /**
      * Gets the by.
      *
@@ -117,6 +155,95 @@ public class Services extends ArrayList<Service>
         return result;
     }
 
+    /**
+     * Gets the by.
+     *
+     * @param year
+     *            the year
+     * @return the by
+     */
+    public Services getBy(final Year year)
+    {
+        Services result;
+
+        result = new Services();
+
+        if (year != null)
+        {
+            for (Service service : this)
+            {
+                Year startYear = service.getStartYear();
+                Year endYear = service.getEndYear();
+                if (endYear == null)
+                {
+                    endYear = Year.now();
+                }
+
+                if ((startYear != null) && (!year.isBefore(startYear)) && (!year.isAfter(endYear)))
+                {
+                    result.add(service);
+                }
+            }
+        }
+
+        //
+        return result;
+    }
+
+    /**
+     * Gets the older.
+     *
+     * @return the older
+     */
+    public Service getOldestService()
+    {
+        Service result;
+
+        result = null;
+        LocalDate oldestDate = null;
+        for (Service current : this)
+        {
+            LocalDate date = current.getStartDate();
+
+            if (date != null)
+            {
+                LocalDate currentDate = current.getStartDate();
+                if ((result == null) || (currentDate.isBefore(oldestDate)))
+                {
+                    result = current;
+                    oldestDate = currentDate;
+                }
+            }
+        }
+
+        //
+        return result;
+    }
+
+    /**
+     * Gets the oldest year.
+     *
+     * @return the oldest year
+     */
+    public Year getOldestStartYear()
+    {
+        Year result;
+
+        Service oldestService = getOldestService();
+
+        if (oldestService == null)
+        {
+            result = null;
+        }
+        else
+        {
+            result = oldestService.getStartYear();
+        }
+
+        //
+        return result;
+    }
+
     /**
      * Reverse.
      *
diff --git a/src/fr/devinsy/statoolinfos/core/StatoolInfosUtils.java b/src/fr/devinsy/statoolinfos/core/StatoolInfosUtils.java
index 529ed25..aec7603 100644
--- a/src/fr/devinsy/statoolinfos/core/StatoolInfosUtils.java
+++ b/src/fr/devinsy/statoolinfos/core/StatoolInfosUtils.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020-2021 Christian Pierre MOMON <christian@momon.org>
+ * Copyright (C) 2020-2022 Christian Pierre MOMON <christian@momon.org>
  * 
  * This file is part of StatoolInfos, simple service statistics tool.
  * 
@@ -27,6 +27,7 @@ import java.time.Instant;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.Period;
+import java.time.Year;
 import java.time.ZoneId;
 import java.time.format.DateTimeFormatter;
 import java.time.format.DateTimeParseException;
@@ -206,6 +207,63 @@ public class StatoolInfosUtils
         return new Date().getTime();
     }
 
+    /**
+     * Overlapp.
+     *
+     * @param start1
+     *            the start 1
+     * @param end1
+     *            the end 1
+     * @param start2
+     *            the start 2
+     * @param end2
+     *            the end 2
+     * @return true, if successful
+     */
+    public static boolean overlapp(final Year start1, final Year end1, final Year start2, final Year end2)
+    {
+        boolean result;
+
+        if ((start1 == null) || (start2 == null))
+        {
+            result = false;
+        }
+        else
+        {
+            Year end11;
+            if (end1 == null)
+            {
+                end11 = Year.now();
+            }
+            else
+            {
+                end11 = end1;
+            }
+
+            Year end22;
+            if (end2 == null)
+            {
+                end22 = Year.now();
+            }
+            else
+            {
+                end22 = end2;
+            }
+
+            if ((end22.isBefore(start1)) || (start2.isAfter(end11)))
+            {
+                result = false;
+            }
+            else
+            {
+                result = true;
+            }
+        }
+
+        //
+        return result;
+    }
+
     /**
      * Parses the date.
      *
@@ -235,6 +293,10 @@ public class StatoolInfosUtils
             {
                 result = LocalDate.parse("01/" + date, DateTimeFormatter.ofPattern("dd/MM/yyyy"));
             }
+            else if (date.matches("\\d{4}-\\d{2}"))
+            {
+                result = LocalDate.parse(date + "-01", DateTimeFormatter.ofPattern("yyyy-MM-dd"));
+            }
             else
             {
                 result = null;
diff --git a/src/fr/devinsy/statoolinfos/htmlize/ChartHtmlizer.java b/src/fr/devinsy/statoolinfos/htmlize/ChartHtmlizer.java
index cf4d63e..10488c8 100644
--- a/src/fr/devinsy/statoolinfos/htmlize/ChartHtmlizer.java
+++ b/src/fr/devinsy/statoolinfos/htmlize/ChartHtmlizer.java
@@ -1451,7 +1451,23 @@ public class ChartHtmlizer
     {
         String result;
 
-        result = htmlizeServiceCountYearChart(federation.getServices(), federation.getStartYear());
+        BarChart chart;
+
+        chart = new BarChart("Nombre de services");
+        chart.addDataset("Services");
+
+        Year current = federation.getStartYear();
+        Year now = Year.now();
+        while (!current.isAfter(now))
+        {
+            long count = federation.getServiceCountBy(current);
+
+            chart.add(String.valueOf(current), count, ChartColor.YELLOW);
+
+            current = current.plusYears(1);
+        }
+
+        result = BarChartView.build(chart);
 
         //
         return result;
@@ -1531,36 +1547,11 @@ public class ChartHtmlizer
 
         if (first != null)
         {
-            int now = LocalDate.now().getYear();
+            int now = Year.now().getValue();
             int current = first;
             while (current <= now)
             {
-                long count = 0;
-                for (Service service : services)
-                {
-                    LocalDate startDate = service.getStartDate();
-                    LocalDate endDate = service.getEndDate();
-
-                    if (startDate != null)
-                    {
-                        int start = startDate.getYear();
-                        int end;
-                        if (endDate == null)
-                        {
-                            end = now;
-                        }
-                        else
-                        {
-                            end = endDate.getYear();
-                        }
-
-                        if ((current >= start) && (current <= end))
-                        {
-                            count += 1;
-                        }
-                    }
-                }
-
+                long count = services.countBy(Year.of(current));
                 chart.add(String.valueOf(current), count, ChartColor.YELLOW);
 
                 current += 1;
diff --git a/src/fr/devinsy/statoolinfos/htmlize/OrganizationHeaderView.java b/src/fr/devinsy/statoolinfos/htmlize/OrganizationHeaderView.java
index e822e27..ced2944 100644
--- a/src/fr/devinsy/statoolinfos/htmlize/OrganizationHeaderView.java
+++ b/src/fr/devinsy/statoolinfos/htmlize/OrganizationHeaderView.java
@@ -84,10 +84,10 @@ public class OrganizationHeaderView
                 data.setContent("organizationMemberOfWord", ":");
             }
 
-            data.setContent("organizationMemberStartDate", StringUtils.defaultIfBlank(organization.getMemberStartDate(), "n/a"));
-            data.setContent("organizationMemberEndDate", StringUtils.defaultIfBlank(organization.getMemberEndDate(), "n/a"));
+            data.setContent("organizationMemberStartDate", StringUtils.defaultIfBlank(organization.getMemberStartDateValue(), "n/a"));
+            data.setContent("organizationMemberEndDate", StringUtils.defaultIfBlank(organization.getMemberEndDateValue(), "n/a"));
             data.setContent("organizationMemberAge", StringUtils.defaultIfBlank(organization.getMemberAge(), "n/a"));
-            if (StringUtils.isBlank(organization.getMemberEndDate()))
+            if (StringUtils.isBlank(organization.getMemberEndDateValue()))
             {
                 data.setAttribute("organizationMemberEndDateData", "style", "display: none;");
             }
diff --git a/src/fr/devinsy/statoolinfos/properties/PathPropertyList.java b/src/fr/devinsy/statoolinfos/properties/PathPropertyList.java
index 7ba9079..12cda43 100644
--- a/src/fr/devinsy/statoolinfos/properties/PathPropertyList.java
+++ b/src/fr/devinsy/statoolinfos/properties/PathPropertyList.java
@@ -24,8 +24,6 @@ import java.net.URL;
 import java.time.LocalDate;
 import java.time.Year;
 import java.time.YearMonth;
-import java.time.format.DateTimeFormatter;
-import java.time.format.DateTimeParseException;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.regex.Matcher;
@@ -315,53 +313,7 @@ public class PathPropertyList extends ArrayList<PathProperty> implements PathPro
     {
         LocalDate result;
 
-        String value = get(path);
-        if (value == null)
-        {
-            result = null;
-        }
-        else
-        {
-            String pattern;
-            if (value.matches("\\d{1,2}/\\d{1,2}/\\d{4}"))
-            {
-                pattern = "dd/MM/yyyy";
-            }
-            else if (value.matches("\\d{4}-\\d{2}-\\d{2}"))
-            {
-                pattern = "yyyy-MM-dd";
-            }
-            else if (value.matches("\\d{1,2}/\\d{4}"))
-            {
-                value = "01/" + value;
-                pattern = "dd/MM/yyyy";
-            }
-            else if (value.matches("\\d{4}-\\d{2}"))
-            {
-                value = value + "-01";
-                pattern = "yyyy-MM-dd";
-            }
-            else
-            {
-                pattern = null;
-            }
-
-            if (pattern == null)
-            {
-                result = null;
-            }
-            else
-            {
-                try
-                {
-                    result = LocalDate.parse(value, DateTimeFormatter.ofPattern(pattern));
-                }
-                catch (DateTimeParseException exception)
-                {
-                    result = null;
-                }
-            }
-        }
+        result = StatoolInfosUtils.parseDate(get(path));
 
         //
         return result;