time module

>>> from time import strptime
>>> from time import localtime
>>> import time
>>> t = time.time()
>>> help(strptime)

Help on built-in function strptime:

strptime(...)

strptime(string, format) -> struct_time

Parse a string to a time tuple according to a format specification. See the library reference manual for formatting codes (same as strftime()).

>>> help(time.strftime)
Help on built-in function strftime:

strftime(...)

strftime(format[, tuple]) -> string

Convert a time tuple to a string according to a format specification. See the library reference manual for formatting codes. When the time tuple is not present, current time as returned by localtime() is used.

>>> localtime()
(2004, 2, 4, 13, 45, 6, 2, 35, 0)
>>> t = localtime()
>>> n = strptime("29/02/1968",'%d/%m/%Y')
>>> n
(1968, 2, 29, 0, 0, 0, 3, 60, -1)
>>> time.strftime("29/02/1968")
'29/02/1968'

>>> t
(2004, 2, 4, 13, 45, 14, 2, 35, 0)
>>> time.asctime(t)
'Wed Feb  4 13:45:14 2004'
>>> time.strftime(t,"%d/%m/%Y")
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: strftime() argument 1 must be string, not time.struct_time
>>> time.strftime("%d/%m/%Y",t)
'04/02/2004'
>>>