Unix时间戳转换(python)

# -*- coding: utf-8 -*-

import time

def timestamp_datetime(value):
    format = '%Y-%m-%d %H:%M:%S'
    # value为传入的值为时间戳(整形)，如：1332888820
    value = time.localtime(value)
    ## 经过localtime转换后变成
    ## time.struct_time(tm_year=2012, tm_mon=3, tm_mday=28, tm_hour=6, tm_min=53, tm_sec=40, tm_wday=2, tm_yday=88, tm_isdst=0)
    # 最后再经过strftime函数转换为正常日期格式。
    dt = time.strftime(format, value)
    return dt

def datetime_timestamp(dt):
     #dt为字符串
     #中间过程，一般都需要将字符串转化为时间数组
     time.strptime(dt, '%Y-%m-%d %H:%M:%S')
     ## time.struct_time(tm_year=2012, tm_mon=3, tm_mday=28, tm_hour=6, tm_min=53, tm_sec=40, tm_wday=2, tm_yday=88, tm_isdst=-1)
     #将"2012-03-28 06:53:40"转化为时间戳
     s = time.mktime(time.strptime(dt, '%Y-%m-%d %H:%M:%S'))
     return int(s)

if __name__ == '__main__':
    d = datetime_timestamp('2012-03-28 06:53:40')
    print d
    s = timestamp_datetime(1332888820)
    print s