--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/timedelta.py	Sat Jan 10 03:50:20 2009 +0100
@@ -0,0 +1,43 @@
+
+from datetime import time
+
+def __toMicroseconds(time):
+    result = time.microsecond
+    result += time.second * 1000000
+    result += time.minute * 60 * 1000000
+    result += time.hour * 60 * 60 * 1000000
+    return result
+
+def timedelta(t1, t2):
+    """Calculate the difference between to datetime.time objects
+    
+    The result is returned as a time object as the datetime.timedelta does not provide
+    the same timeunits (hour, minute etc.) as the time objects that come as input to 
+    this routine.
+    
+    This method always returns a positive difference, i.e. the order in which the two
+    time objects are passed does not matter.
+    """
+    min = t1
+    max = t2
+    if t2 < t1:
+        min = t2
+        max = t1
+    
+    total1 = __toMicroseconds(min)
+    total2 = __toMicroseconds(max)
+    
+    difference = total2 - total1
+    
+    hours = ((difference / 1000000) / 60) / 60
+    difference -= hours * 60 * 60 * 1000000
+    
+    minutes = (difference / 1000000) / 60
+    difference -= minutes * 60 * 1000000
+    
+    seconds = difference / 1000000
+    difference -= seconds* 1000000
+    
+    micro = difference 
+    return time(hour=hours, minute=minutes, second=seconds, microsecond=micro)
+