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" ,想改成 a = "2013/10/10 23:40:00"

     方法:先轉換爲時間數組,而後轉換爲其餘格式

     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,而後格式化爲須要的格式,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

         得到當前時間時間戳

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

         轉換爲其餘日期格式,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

         得到當前時間

         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 .得到三天前的時間

     方法:

         import time

         import datetime

         先得到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()))

         轉換爲其餘字符串格式:

             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 ,能夠轉換爲其餘的任意格式了

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" ,想改成 a = "2013/10/10 23:40:00"

     方法:先轉換爲時間數組,而後轉換爲其餘格式

     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,而後格式化爲須要的格式,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

         得到當前時間時間戳

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

         轉換爲其餘日期格式,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

         得到當前時間

         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 .得到三天前的時間

     方法:

         import time

         import datetime

         先得到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()))

         轉換爲其餘字符串格式:

             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 ,能夠轉換爲其餘的任意格式了