折腾：
［已解决］Flask中的templates的html中格式化datetime
期间，用代码：
@app.template_filter(‘datetime_format’) def _jinja2_filter_datetime_format(datetimeValue, format=‘%M/%d %H:%m’): """convert a datetime to a different format.""" return datetimeValue.strftime(format) |
格式化日期时间，得到的值是：
11/24 20:08
不是希望的：
8/24 20:8
去搜：
python strftime
Python time strftime()方法 | 菜鸟教程
http://www.runoob.com/python/att-time-strftime.html
->发现strftime是time才有的方法
－》我此处的是datetime
Python time strptime()方法 | 菜鸟教程
http://www.runoob.com/python/att-time-strptime.html
15.3. time — Time access and conversions — Python 2.7.12 documentation
https://docs.python.org/2/library/time.html
python datetime format
python对时间日期做格式化 – 走到天亮 – 博客园
http://www.cnblogs.com/65702708/archive/2011/04/17/2018936.html
8.1. datetime — Basic date and time types — Python 2.7.12 documentation
https://docs.python.org/2/library/datetime.html
“
Return a string representing the date and time, controlled by an explicit format string. For a complete list of formatting directives, see section strftime() and strptime() Behavior.
"
结果发现：
此处的strftime的格式，是参考：
［已解决］swift格式化日期时间为字符串的完整的格式的语法
以为是：
m＝minute
M＝Month
所以此处是用：
%M/%d %H:%m
想要输出：
月/日 时:分
但是官网的示例中是：
>>> d.strftime("%d/%m/%y") ’11/03/02′ datetime.strptime("21/11/06 16:30", "%d/%m/%y %H:%M") dt.strftime("%A, %d. %B %Y %I:%M%p") ‘Tuesday, 21. November 2006 04:30PM’ |
->
此处的是：
M=minute
m=Month
看来：
之前的通用的
［已解决］swift格式化日期时间为字符串的完整的格式的语法
和此处的Python的日期时间的格式化的语法，是不一样的。。。
此处的Python中的日期时间的格式化的语法是：
8.1. datetime — Basic date and time types — Python 2.7.12 documentation
https://docs.python.org/2/library/datetime.html#strftime-strptime-behavior
“
| Directive | Meaning | Example | Notes |
|---|---|---|---|
%a | Weekday as locale’s abbreviated name. | Sun, Mon, …, Sat (en_US); So, Mo, …, Sa (de_DE) | (1) |
%A | Weekday as locale’s full name. | Sunday, Monday, …, Saturday (en_US); Sonntag, Montag, …, Samstag (de_DE) | (1) |
%w | Weekday as a decimal number, where 0 is Sunday and 6 is Saturday. | 0, 1, …, 6 | |
%d | Day of the month as a zero-padded decimal number. | 01, 02, …, 31 | |
%b | Month as locale’s abbreviated name. | Jan, Feb, …, Dec (en_US); Jan, Feb, …, Dez (de_DE) | (1) |
%B | Month as locale’s full name. | January, February, …, December (en_US); Januar, Februar, …, Dezember (de_DE) | (1) |
%m | Month as a zero-padded decimal number. | 01, 02, …, 12 | |
%y | Year without century as a zero-padded decimal number. | 00, 01, …, 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, 01, …, 23 | |
%I | Hour (12-hour clock) as a zero-padded decimal number. | 01, 02, …, 12 | |
%p | Locale’s equivalent of either AM or PM. | AM, PM (en_US); am, pm (de_DE) | (1), (2) |
%M | Minute as a zero-padded decimal number. | 00, 01, …, 59 | |
%S | Second as a zero-padded decimal number. | 00, 01, …, 59 | (3) |
%f | Microsecond as a decimal number, zero-padded on the left. | 000000, 000001, …, 999999 | (4) |
%z | UTC offset in the form +HHMM or -HHMM (empty string if the the object is naive). | (empty), +0000, -0400, +1030 | (5) |
%Z | Time zone name (empty string if the object is naive). | (empty), UTC, EST, CST | |
%j | Day of the year as a zero-padded decimal number. | 001, 002, …, 366 | |
%U | Week number of the year (Sunday as the first day of the week) as a zero padded decimal number. All days in a new year preceding the first Sunday are considered to be in week 0. | 00, 01, …, 53 | (6) |
%W | Week number of the year (Monday as the first day of the week) as a decimal number. All days in a new year preceding the first Monday are considered to be in week 0. | 00, 01, …, 53 | (6) |
%c | Locale’s appropriate date and time representation. | Tue Aug 16 21:30:00 1988 (en_US); Di 16 Aug 21:30:00 1988 (de_DE) | (1) |
%x | Locale’s appropriate date representation. | 08/16/88 (None); 08/16/1988 (en_US); 16.08.1988 (de_DE) | (1) |
%X | Locale’s appropriate time representation. | 21:30:00 (en_US); 21:30:00 (de_DE) | (1) |
%% | A literal '%' character. | % |
”
所以，此处改为：
@app.template_filter(‘datetime_format’) # def _jinja2_filter_datetime_format(datetimeValue, format=’%M/%d %H:%m’): def _jinja2_filter_datetime_format(datetimeValue, format=‘%m/%d %H:%M’): """convert a datetime to a different format.""" return datetimeValue.strftime(format) |
即可输出：
08/24 20:11
了。
［总结］
Python中的datetime（以及date，time），在涉及到用strptime去parse解析字符串为变量，或用strftime去format格式化输出的时候，对应的语法是：
8.1. datetime — Basic date and time types — Python 2.7.12 documentation
https://docs.python.org/2/library/datetime.html#strftime-strptime-behavior
其中需要注意的是：
1.其和之前别的地方总结的
关于日期时间的格式化的通用的语法：
［已解决］swift格式化日期时间为字符串的完整的格式的语法
有点不一样：
Python中是：
%M=minute＝分钟
%m=month＝月份
而其它通用的语法是：
%M=month＝月份
%m=minute＝分钟
2.且Python中的datetime的strftime的语法：
%d Day of the month as a zero-padded decimal number. 01, 02, …, 31 %m Month as a zero-padded decimal number. 01, 02, …, 12 %H Hour (24-hour clock) as a zero-padded decimal number. 00, 01, …, 23 %M Minute as a zero-padded decimal number. 00, 01, …, 59 |
此处，不支持：
月份 日期 小时 分钟
的如果是有一位数，就输出一位数
而是：
如果是一位数，比如8，也是前面补0，显示两位数的08
而其它很多地方，是支持的，不带补0，在只有1位时只显示1位的。