[Python] 時間格式轉換

時間格式，在所有程式語言都是必學的。

• strftime ： datetime object 轉換成String
• strptime ： datetime string 轉換成object

顯示目前時間範例：

import datetime
datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")

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轉換字串為日期物件：

datetime_object = datetime.strptime(last_modified_time, '%Y-%m-%d %H:%M:%S')

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取出 timestamp：

datetime.timestamp(datetime_object)

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指派 timestamp 到 datetime object：

obj = datetime.timestamp(datetime_object)

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For reference, here are the codes used in the mini-language:

• %a Weekday as locale’s abbreviated name.
• %A Weekday as locale’s full name.
• %w Weekday as a decimal number, where 0 is Sunday and 6 is Saturday.
• %d Day of the month as a zero-padded decimal number.
• %b Month as locale’s abbreviated name.
• %B Month as locale’s full name.
• %m Month as a zero-padded decimal number. 01, …, 12
• %y Year without century as a zero-padded decimal number. 00, …, 99
• %Y Year with century as a decimal number. 1970, 1988, 2001, 2013
• %H Hour (24-hour clock) as a zero-padded decimal number. 00, …, 23
• %I Hour (12-hour clock) as a zero-padded decimal number. 01, …, 12
• %p Locale’s equivalent of either AM or PM.
• %M Minute as a zero-padded decimal number. 00, …, 59
• %S Second as a zero-padded decimal number. 00, …, 59
• %f Microsecond as a decimal number, zero-padded on the left. 000000, …, 999999
• %z UTC offset in the form +HHMM or -HHMM (empty if naive), +0000, -0400, +1030
• %Z Time zone name (empty if naive), UTC, EST, CST
• %j Day of the year as a zero-padded decimal number. 001, …, 366
• %U Week number of the year (Sunday is the first) as a zero padded decimal number.
• %W Week number of the year (Monday is first) as a decimal number.
• %c Locale’s appropriate date and time representation.
• %x Locale’s appropriate date representation.
• %X Locale’s appropriate time representation.
• %% A literal ‘%’ character.