工作中遇到了很多需要時間轉換的時候，記錄一下，也不用每次都查看啦

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1.日期格式化

我用time模塊比較多，也可以使用datetime.datetime模塊

1）str轉date型

time.strptime(date_str, format)

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2）date型轉str

time.strftime(format, date_tuple)

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3）timestamp轉date

datetime.datetime.fromtimestamp(int(timestamp)).strftime(time_format)

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4）date轉timestamp

int(time.mktime(datetime.datetime.strptime(date, time_format).timetuple()))

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2.日期加減

在datetime模塊中有timedelta類，這個類的對象用于表示一個時間間隔，比如兩個日期或者時間的差別，也可以用于直接計算日期時間的加減。

1）兩個日期相差多少天

day1 = datetime.datetime.strptime('2016-03-29', '%Y-%m-%d') day2 = datetime.datetime.strptime('2016-03-25', '%Y-%m-%d') delta = day1 - day2 print delta.days

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2）某一個時間的第N天

s_t = datetime.datetime.strptime(sometime_str, time_format) s_t = s_t + datetime.timedelta(days=day_add)

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3.關于format參數

%a ? ? Abbreviated weekday name
%A ? ? Full weekday name
%b ? ? Abbreviated month name
%B ? ? Full month name
%c ? ? Date and time representation appropriate for locale
%d ? ? Day of month as decimal number (01 - 31)
%H ? ? Hour in 24-hour format (00 - 23)
%I ? ? Hour in 12-hour format (01 - 12)
%j ? ? Day of year as decimal number (001 - 366)
%m ? ? Month as decimal number (01 - 12)
%M ? ? Minute as decimal number (00 - 59)
%p ? ? Current locale's A.M./P.M. indicator for 12-hour clock
%S ? ? Second as decimal number (00 - 59)
%U ? ? Week of year as decimal number, with Sunday as first day of week (00 - 51)
%w ? ? Weekday as decimal number (0 - 6; Sunday is 0)
%W ? ? Week of year as decimal number, with Monday as first day of week (00 - 51)
%x ? ? Date representation for current locale
%X ? ? Time representation for current locale
%y ? ? Year without century, as decimal number (00 - 99)
%Y ? ? Year with century, as decimal number
%z, %Z ? ? Time-zone name or abbreviation; no characters if time zone is unknown
%% ? ? Percent sign

轉載于:https://www.cnblogs.com/sherry-song/p/5333368.html

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