--- a/ztfy/utils/date.py	Mon Nov 15 01:50:36 2010 +0100
+++ b/ztfy/utils/date.py	Tue Dec 07 17:24:39 2010 +0100
@@ -23,10 +23,13 @@
 
 # import Zope3 packages
 from zope.datetime import parseDatetimetz
+from zope.i18n import translate
 
 # import local packages
 from timezone import gmtime
 
+from ztfy.utils import _
+
 
 def unidate(value):
     """Get specified date converted to unicode ISO format
@@ -70,3 +73,33 @@
     if type(value) is datetime:
         return value
     return datetime(value.year, value.month, value.day)
+
+
+def getAge(value):
+    """Get age of a given datetime (including timezone) compared to current datetime (in UTC)
+    
+    @param value: a datetime value, including timezone
+    @type value: datetime
+    @return: string representing value age
+    @rtype: gettext translated string
+    """
+    now = gmtime(datetime.utcnow())
+    delta = now - value
+    if delta.days > 60:
+        return translate(_("%d months ago")) % int(round(delta.days * 1.0 / 30))
+    elif delta.days > 10:
+        return translate(_("%d weeks ago")) % int(round(delta.days * 1.0 / 7))
+    elif delta.days > 2:
+        return translate(_("%d days ago")) % delta.days
+    elif delta.days == 2:
+        return translate(_("the day before yesterday"))
+    elif delta.days == 1:
+        return translate(_("yesterday"))
+    else:
+        hours = int(round(delta.seconds * 1.0 / 3600))
+        if hours > 1:
+            return translate(_("%d hours ago")) % hours
+        elif delta.seconds > 300:
+            return translate(_("%d minutes ago")) % int(round(delta.seconds * 1.0 / 60))
+        else:
+            return translate(_("less than 5 minutes ago"))