Python date.strftime()方法 (Python date.strftime() Method)

date.strftime() method is used to manipulate objects of date class of module datetime.

date.strftime()方法用于操作模塊datetime的日期類的對象。

It takes an instance of the class and returns a string representing the date, which is controlled by an explicit format string. Since this class has attributes related to dates only, format codes referring to hours, minutes, or seconds have 0 values.

它使用類的實例，并返回表示日期的字符串，該字符串由顯式格式字符串控制。 由于此類僅具有與日期有關的屬性，因此引用小時，分鐘或秒的格式代碼具有0值。

Module:

模塊：

    import datetime

Class:

類：

    from datetime import date

Syntax:

句法：

    strftime(format)

Parameter(s):

參數：

• format - it is the string format code based on which string representation and formatting occurs. For example, %Y, %m, %d etc. are format codes. This method takes one or more format codes as an argument and returns a formatted string based on that.

  format-它是字符串格式代碼，基于該代碼的字符串表示形式和格式發生。 例如，％Y，％m，％d等是格式代碼。 此方法將一個或多個格式代碼作為參數，并根據該格式返回格式化的字符串。

Given below is a list of all the format codes available:

以下是所有可用格式代碼的列表：

Directive	Meaning	Example
%a	Abbreviated weekday name.	Sun, Mon, ...
%A	Full weekday name.	Sunday, Monday, ...
%w	Weekday as a decimal number.	0, 1, ..., 6
%d	Day of the month as a zero-padded decimal.	01, 02, ..., 31
%-d	Day of the month as a decimal number.	1, 2, ..., 30
%b	Abbreviated month name.	Jan, Feb, ..., Dec
%B	Full month name.	January, February, ...
%m	Month as a zero-padded decimal number.	01, 02, ..., 12
%-m	Month as a decimal number.	1, 2, ..., 12
%y	Year without century as a zero-padded decimal number.	00, 01, ..., 99
%-y	Year without century as a decimal number.	0,1, 2, … , 99
%Y	Year with century as a decimal number.	2020, 2019 etc
%H	Hour (24-hour clock) as a zero-padded decimal number.	00, 01, ..., 23
%-H	Hour (24-hour clock) as a decimal number.	0, 1, 2, ..., 23
%I	Hour (12-hour clock) as a zero-padded decimal number.	01, 02, ..., 12
%-I	Hour (12-hour clock) as a decimal number.	1,2,.., 12
%p	Local AM or PM.	AM, PM
%M	Minute as a zero-padded decimal number.	00, 01, ..., 59
%-M	Minute as a decimal number.	0, 1, ..., 59
%S	Second as a zero-padded decimal number.	00, 01, ..., 59
%-S	Second as a decimal number.	0, 1, ..., 59
%f	Microsecond as a decimal number,zero-padded on the left.	000000 - 999999
%z	UTC offset in the form +HHMM or -HHMM.
%Z	Time zone name.
%j	Day of the year as a zero-padded decimal number.	001, 002, ..., 366
%-j	Day of the year as a decimal number.	1, 2, ..., 366
%c	Appropriate local date and time representation	Wed Oct 27 01:04:15 2020
%x	Appropriate local date representation.	09/30/13
%X	Appropriate local time representation.	09:07:06
%U	Week number of the year, with Sunday as the first day of the week	00, 01, ..., 53
%W	Week number of the year, with Monday as the first day of the week	00, 01, ..., 53

指示	含義	例
％一個	工作日名稱的縮寫。	周日，周一...
％一個	工作日全名。	星期天星期一， ...
％w	工作日為十進制數字。	0，1，...，6
％d	月份中的一天，以零填充的十進制表示。	01，02，...，31
％d	以十進制數表示的月份中的一天。	1，2，...，30
％b	縮寫的月份名稱。	一月，二月，...，十二月
％B	完整的月份名稱。	一月二月， ...
％m	以零填充的十進制數字表示的月份。	01、02，...，12
％-m	以十進制數表示的月份。	1，2，...，12
％y	無世紀的年份，為零填充的十進制數字。	00、01，...，99
％-y	沒有世紀的年份作為十進制數字。	0,1，2，…，99
％Y	以世紀作為十進制數字的年份。	2020、2019等
％H	小時(24小時制)，為補零的十進制數字。	00、01，...，23
％-H	小時(24小時制)為十進制數字。	0，1，2，...，23
％一世	小時(12小時制)，為零填充的十進制數字。	01、02，...，12
％-一世	小時(12小時制)為十進制數字。	1,2，..，12
％p	本地AM或PM。	上午下午
％M	分鐘，為零填充的十進制數字。	00、01，...，59
％-M	以十進制數字表示。	0，1，...，59
％S	第二個為零填充的十進制數。	00、01，...，59
％-S	第二個十進制數字。	0，1，...，59
％F	微秒，十進制數，在左側補零。	000000-999999
％z	UTC偏移量，格式為+ HHMM或-HHMM。
％Z	時區名稱。
％j	一年中的一天，為零填充的十進制數字。	001，002，...，366
％-j	一年中的天，以十進制數字表示。	1，2，...，366
％C	適當的本地日期和時間表示	2020年10月27日星期三01:04:15
％X	適當的本地日期表示形式。	13/9/30
％X	適當的本地時間表示。	09:07:06
％U	一年中的第幾周，以星期日為一周的第一天	00、01，...，53
％W	一年中的第幾周，星期一為一周的第一天	00、01，...，53

Please note all the codes which have time and timezone information, will have 0 values as date class only contains date attributes.

請注意，所有具有時間和時區信息的代碼都將具有0值，因為日期類僅包含日期屬性。

Return value:

返回值：

The return type of this method is a string converted according to the format code.

此方法的返回類型是根據格式代碼轉換的字符串。

Example:

例：

## Python program explaining the 
## use of strftime() method in date class
from datetime import date
## Creating an instance
x = date.today()
c = x.strftime("%c")
print("Date representation using strftime:", c)
print()
##You can extract information using these methods
print("Abbreviated weekday name:", x.strftime("%a"))
print("Full weekday name:", x.strftime("%A"))
print("Weekday as a decimal number:", x.strftime("%w"))
print("Day of the month as a zero-padded decimal:", x.strftime("%d"))
print("Full month name:", x.strftime("%B"))
print("Month as a decimal number:", x.strftime("%-m"))
print("Year with century as a decimal number:", x.strftime("%Y"))
print("What day of the year is it?", x.strftime("%-j"))
print("What is the week number of this day?", x.strftime("%U"))
##or x.strftime("%W")
print()
## Different ways of representing the Date 
## as a date string
print("Output 1:", x.strftime("%d %m %Y"))
print("Output 2:", x.strftime("%-d %-m %y, %H %M %S"))
## time values will be 0
print("Output 3:", x.strftime("%a %d %B %Y"))
print("Output 4:", x.strftime("%A, %Y %m %d, %H:%M:%S"))
print("Output 5:", x.strftime("%x"))
## You can create any combination of the date 
## representation you want 

Output

輸出量

Date representation using strftime: Thu Apr 30 00:00:00 2020
Abbreviated weekday name: Thu
Full weekday name: Thursday
Weekday as a decimal number: 4
Day of the month as a zero-padded decimal: 30
Full month name: April
Month as a decimal number: 4
Year with century as a decimal number: 2020
What day of the year is it? 121
What is the week number of this day? 17
Output 1: 30 04 2020
Output 2: 30 4 20, 00 00 00
Output 3: Thu 30 April 2020
Output 4: Thursday, 2020 04 30, 00:00:00
Output 5: 04/30/20

翻譯自: https://www.includehelp.com/python/date-strftime-method-with-example.aspx