diff --git a/ChangeLog b/ChangeLog
index 69098850d..0787be8c6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-07-01  Wolfgang Sourdeau  <wsourdeau@inverse.ca>
+
+	* OpenChange/NSDate+MAPIStore.m (NSDateCompare): new comparison
+	function for sorting array of NSDate instances.
+
 2012-06-30  Wolfgang Sourdeau  <wsourdeau@inverse.ca>
 
 	* OpenChange/NSObject+MAPIStore.h: renamed
diff --git a/OpenChange/NSDate+MAPIStore.h b/OpenChange/NSDate+MAPIStore.h
index 3c7809f79..0a01a2ddc 100644
--- a/OpenChange/NSDate+MAPIStore.h
+++ b/OpenChange/NSDate+MAPIStore.h
@@ -25,9 +25,11 @@
 
 #import <Foundation/NSDate.h>
 
+@class NSCalendarDate;
+
 @interface NSDate (MAPIStoreDataTypes)
 
-+ (id) dateFromMinutesSince1601: (uint32_t) minutes;
++ (NSCalendarDate *) dateFromMinutesSince1601: (uint32_t) minutes;
 - (uint32_t) asMinutesSince1601;
 
 + (id) dateFromFileTime: (const struct FILETIME *) timeValue;
@@ -37,4 +39,6 @@
 
 @end
 
+NSComparisonResult NSDateCompare (NSDate *date1, NSDate *date2, void *);
+
 #endif /* NSCALENDARDATE+MAPISTORE_H */
diff --git a/OpenChange/NSDate+MAPIStore.m b/OpenChange/NSDate+MAPIStore.m
index eb873978b..1e631b82b 100644
--- a/OpenChange/NSDate+MAPIStore.m
+++ b/OpenChange/NSDate+MAPIStore.m
@@ -51,7 +51,7 @@ _setupRefDate ()
                   timeZone: [NSTimeZone timeZoneWithName: @"UTC"]];
 }
 
-+ (id) dateFromMinutesSince1601: (uint32_t) minutes
++ (NSCalendarDate *) dateFromMinutesSince1601: (uint32_t) minutes
 {
   NSCalendarDate *result;
 
@@ -129,3 +129,22 @@ _setupRefDate ()
 }
 
 @end
+
+NSComparisonResult
+NSDateCompare (NSDate *date1, NSDate *date2, void *ctx)
+{
+  NSTimeInterval secs1, secs2;
+  NSComparisonResult result;
+
+  secs1 = [date1 timeIntervalSince1970];
+  secs2 = [date2 timeIntervalSince1970];
+  if (secs1 == secs2)
+    result = NSOrderedSame;
+  else if (secs1 < secs2)
+    result = NSOrderedAscending;
+  else
+    result = NSOrderedDescending;
+
+  return result;
+}
+