8.1. datetime — Basic date and time types — Python v2.7.3 documentation

8.1. datetime — Basic date and time types — Python v2.7.3 documentation

Note that normalization of negative values may be surprising at first. For
example,

>>>

>>> from datetime import timedelta
>>> d = timedelta(microseconds=-1)
>>> (d.days, d.seconds, d.microseconds)
(-1, 86399, 999999)