Python時間，日期，時間戳之間轉換

1.將字符串的時間轉換爲時間戳

    方法:

        a = "2013-10-10 23:40:00"

        將其轉換爲時間數組

        import time

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

    轉換爲時間戳:

    timeStamp = int(time.mktime(timeArray))

    timeStamp == 1381419600

2.字符串格式更改

    如a = "2013-10-10 23:40:00",想改爲 a = "2013/10/10 23:40:00"

    方法:先轉換爲時間數組,然後轉換爲其他格式

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

    otherStyleTime = time.strftime("%Y/%m/%d %H:%M:%S", timeArray)

 

 

3.時間戳轉換爲指定格式日期:

    方法一:

        利用localtime()轉換爲時間數組,然後格式化爲需要的格式,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.獲取當前時間並轉換爲指定日期格式

    方法一:

        import time

        獲得當前時間時間戳

        now = int(time.time())  ->這是時間戳

        轉換爲其他日期格式,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

        獲得當前時間

        now = datetime.datetime.now()  ->這是時間數組格式

        轉換爲指定的格式:

        otherStyleTime = now.strftime("%Y-%m-%d %H:%M:%S")

 

5.獲得三天前的時間

    方法:

        import time

        import datetime

        先獲得時間數組格式的日期

        threeDayAgo = (datetime.datetime.now() - datetime.timedelta(days = 3))

        轉換爲時間戳:

            timeStamp = int(time.mktime(threeDayAgo.timetuple()))

        轉換爲其他字符串格式:

            otherStyleTime = threeDayAgo.strftime("%Y-%m-%d %H:%M:%S")

    注:timedelta()的參數有:days,hours,seconds,microseconds

 

6.給定時間戳,計算該時間的幾天前時間:

    timeStamp = 1381419600

    先轉換爲datetime

    import datetime

    import time

    dateArray = datetime.datetime.utcfromtimestamp(timeStamp)

    threeDayAgo = dateArray - datetime.timedelta(days = 3)

    參考5,可以轉換爲其他的任意格式了