不多说，python中用到日期、时间的话使用datetime这个模块，下面给出一些简单的用法示例，包括创建实例、格式化、由字符串创建实例、简单计算等等。
Python代码：
# -*- coding: utf8 -*-
from datetime import datetime
#get current datetime
datetime_now = datetime.now()
print "now:", datetime_now
#create two datetime object
datetime1 = datetime(year = 2012, month = 2, day = 28)
datetime2 = datetime(year = 2012, month = 2, day = 29, hour = 12, minute = 30, second = 30, microsecond = 1000)
print "datetime1:", datetime1, " datetime2:", datetime2
#format
##%a Locale’s abbreviated weekday name.
##%A Locale’s full weekday name.
##%b Locale’s abbreviated month name.
##%B Locale’s full month name.
##%c Locale’s appropriate date and time representation.
##%d Day of the month as a decimal number [01,31].
##%H Hour (24-hour clock) as a decimal number [00,23].
##%I Hour (12-hour clock) as a decimal number [01,12].
##%j Day of the year as a decimal number [001,366].
##%m Month as a decimal number [01,12].
##%M Minute as a decimal number [00,59].
##%p Locale’s equivalent of either AM or PM. (1)
##%S Second as a decimal number [00,61]. (2)
##%U Week number of the year (Sunday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Sunday are considered to be in week 0. (3)
##%w Weekday as a decimal number [0(Sunday),6].
##%W Week number of the year (Monday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Monday are considered to be in week 0. (3)
##%x Locale’s appropriate date representation.
##%X Locale’s appropriate time representation.
##%y Year without century as a decimal number [00,99].
##%Y Year with century as a decimal number.
##%Z Time zone name (no characters if no time zone exists).
##%% A literal '%' character.
print datetime1.strftime("%d/%m/%y")
print datetime2.strftime("%A %d. %B %Y")
#strptime
str_time = "Sat Mar 28 22:24:24 2009"
b = datetime.strptime(str_time, "%a %b %d %H:%M:%S %Y")
print b
#calculate
delta_T = datetime2 - datetime1
print "delta_T:", delta_T, ";delta_T.seconds:", delta_T.seconds, ";delta_T.total_seconds():", delta_T.total_seconds()
print datetime1 < datetime2
输出：
now: 2012-02-29 10:42:34.625000
datetime1: 2012-02-28 00:00:00 datetime2: 2012-02-29 12:30:30.001000
28/02/12
Wednesday 29. February 2012
2009-03-28 22:24:24
delta_T: 1 day, 12:30:30.001000 ;delta_T.seconds: 45030 ;delta_T.total_seconds(): 131430.001
True
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