--- a/utils.py	Tue Feb 10 23:59:56 2009 +0200
+++ b/utils.py	Wed Feb 11 00:33:21 2009 +0200
@@ -67,13 +67,27 @@
         """
             timestamp_str -> pytz.utc datetime.datetime
         """
-
-        return datetime.datetime.utcfromtimestamp(int(timestamp_str)).replace(tzinfo=pytz.utc)
+        
+        return from_utc_timestamp(int(timestamp_str))
     
     def build (self, dtz) :
         """
             pytz.utc datetime.datetime -> timestamp_str
         """
+        
+        return str(to_utc_timestamp(dtz))
 
-        return str(calendar.timegm(dtz.utctimetuple()))
+def from_utc_timestamp (timestamp) :
+    """
+        Converts a UNIX timestamp into a datetime.datetime
+    """
 
+    return datetime.datetime.utcfromtimestamp(timestamp).replace(tzinfo=pytz.utc)
+
+def to_utc_timestamp (dt) :
+    """
+        Converts a datetime.datetime into a UNIX timestamp
+    """
+
+    return calendar.timegm(dt.utctimetuple())
+