Python时间，日期，时间戳之间转换

1.将字符串的时间转换为时间戳

    方法:

        a = "2013-10-10 23:40:00"

        将其转换为时间数组

        import time

        timeArray = time.strptime(a, "%Y-%m-%d %H:%M:%S")

    转换为时间戳:

    timeStamp = int(time.mktime(timeArray))

    timeStamp == 1381419600

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2.字符串格式更改     如a = "2013-10-10 23:40:00",想改为 a = "2013/10/10 23:40:00"     方法:先转换为时间数组,然后转换为其他格式     timeArray = time.strptime(a, "%Y-%m-%d %H:%M:%S")     otherStyleTime = time.strftime("%Y/%m/%d %H:%M:%S", timeArray)     3.时间戳转换为指定格式日期:     方法一:         利用localtime()转换为时间数组,然后格式化为需要的格式,如         timeStamp = 1381419600         timeArray = time.localtime(timeStamp)         otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)         otherStyletime == "2013-10-10 23:40:00"       方法二:         import datetime         timeStamp = 1381419600         dateArray = datetime.datetime.utcfromtimestamp(timeStamp)         otherStyleTime = dateArray.strftime("%Y-%m-%d %H:%M:%S")         otherStyletime == "2013-10-10 23:40:00"   4.获取当前时间并转换为指定日期格式     方法一:         import time         获得当前时间时间戳         now = int(time.time())  ->这是时间戳         转换为其他日期格式,如:"%Y-%m-%d %H:%M:%S"         timeArray = time.localtime(timeStamp)         otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)       方法二:         import datetime         获得当前时间         now = datetime.datetime.now()  ->这是时间数组格式         转换为指定的格式:         otherStyleTime = now.strftime("%Y-%m-%d %H:%M:%S")   5.获得三天前的时间     方法:         import time         import datetime         先获得时间数组格式的日期         threeDayAgo = (datetime.datetime.now() - datetime.timedelta(days = 3))         转换为时间戳:             timeStamp = int(time.mktime(threeDayAgo.timetuple()))         转换为其他字符串格式:             otherStyleTime = threeDayAgo.strftime("%Y-%m-%d %H:%M:%S")     注:timedelta()的参数有:days,hours,seconds,microseconds   6.给定时间戳,计算该时间的几天前时间:     timeStamp = 1381419600     先转换为datetime     import datetime     import time     dateArray = datetime.datetime.utcfromtimestamp(timeStamp)     threeDayAgo = dateArray - datetime.timedelta(days = 3)     参考5,可以转换为其他的任意格式了