I think I have found an inconsistency in the Zope DateTime class. The following piece of code illustrates it. #!/usr/bin/python import DateTime now = DateTime.DateTime() for x in range(0,24): dt = DateTime.DateTime('%04d-%02d-%02d %02d:30:00' % (now.year(), now.month(), now.day(),x)) print dt.parts() # end of code Here is the output on my Debian Linux box. (2000, 3, 21, 0, 30, 0.0, 'US/Pacific') (2000, 3, 21, 1, 30, 0.0, 'US/Pacific') (2000, 3, 21, 2, 30, 0.0, 'US/Pacific') (2000, 3, 21, 3, 30, 0.0, 'US/Pacific') (2000, 3, 21, 4, 30, 0.0, 'US/Pacific') (2000, 3, 21, 5, 30, 0.0, 'US/Pacific') (2000, 3, 21, 6, 30, 0.0, 'US/Pacific') (2000, 3, 21, 7, 30, 0.0, 'US/Pacific') (2000, 3, 21, 8, 29, 60.0, 'US/Pacific') (2000, 3, 21, 9, 30, 0.0, 'US/Pacific') (2000, 3, 21, 10, 30, 0.0, 'US/Pacific') (2000, 3, 21, 11, 30, 0.0, 'US/Pacific') (2000, 3, 21, 12, 30, 0.0, 'US/Pacific') (2000, 3, 21, 13, 30, 0.0, 'US/Pacific') (2000, 3, 21, 14, 30, 7.27595761418e-12, 'US/Pacific') (2000, 3, 21, 15, 30, 0.0, 'US/Pacific') (2000, 3, 21, 16, 30, 0.0, 'US/Pacific') (2000, 3, 21, 17, 30, 7.27595761418e-12, 'US/Pacific') (2000, 3, 21, 18, 30, 0.0, 'US/Pacific') (2000, 3, 21, 19, 30, 0.0, 'US/Pacific') (2000, 3, 21, 20, 30, 0.0, 'US/Pacific') (2000, 3, 21, 21, 30, 0.0, 'US/Pacific') (2000, 3, 21, 22, 30, 0.0, 'US/Pacific') (2000, 3, 21, 23, 30, 0.0, 'US/Pacific') Notice that at 8:30 am the DateTime class prints 8:29:60 instead of 8:30:00. Then notice at 2:30 and 5:30 the number of seconds is slight off too. I have not found the cause yet. Has anyone noticed this problem too? Norman Alderman