python日期操作

python日期操作用到庫time, datetime

格式化字串含義：

%a Abbreviated weekday name 本地化星期縮略格式
%A Full weekday name 本地化星期完整格式
%b Abbreviated month name 本地化月份縮略格式
%B Full month name 本地化月份完整格式
%c Date and time representation appropriate for locale 本地化日期與時間表示
%d Day of month as decimal number (01 - 31) 月份內日期索引
%H Hour in 24-hour format (00 - 23) 24小時索引
%I Hour in 12-hour format (01 - 12) 12小時索引
%j Day of year as decimal number (001 - 366) 年內日期索引
%m Month as decimal number (01 - 12) 月份索引
%M Minute as decimal number (00 - 59) 分鐘索引
%p Current locale`s A.M./P.M. indicator for 12-hour clock 本地化上午/下午指示符
%S Second as decimal number (00 - 59) 秒索引
%U Week of year as decimal number, with Sunday as first day of week (00 - 51) 年內星期索引, 以週日為一週開始
%w Weekday as decimal number (0 - 6; Sunday is 0) 周內星期索引，週日為0
%W Week of year as decimal number, with Monday as first day of week (00 - 51) 年內星期索引, 以週一為一週開始
%x Date representation for current locale 本地化日期表示
%X Time representation for current locale 本地化時間表示
%y Year without century, as decimal number (00 - 99) 世紀內年份索引, 即相當於兩位年份表示
%Y Year with century, as decimal number 帶世紀值年份索引
%z, %Z Time-zone name or abbreviation; no characters if time zone is unknown 時區名稱或縮寫, 未知時為空
%% Percent sign 百分號轉義

示例程式碼1(python 3)：

# coding=utf-8

import time, datetime

# strftime(string)函式用於返回格式化日期字串
# 格式化當前日期
now = datetime.datetime.now().strftime(`%b-%d-%y %H:%M:%S`)
print(now)

# strptime(string, string)函式用於返回由特定格式解析得到的日期物件
nowObj = datetime.datetime.strptime(`15-Sep-21 16:34`, `%y-%b-%d %H:%M`)
print(nowObj)
print(nowObj.strftime(`%b-%d-%Y %H:%M`))

輸出結果：

Dec-11-15 11:33:23
2015-09-21 16:34:00
Sep-21-2015 16:34

示例程式碼2

import time, datetime

startDate = datetime.datetime.strptime(`20150916`, `%Y%m%d`)
endDate = datetime.datetime.strptime(`20150921`, `%Y%m%d`)
oneday=datetime.timedelta(days=1)
while startDate != endDate:
    print(startDate.strftime(`%Y%m%d`))
    startDate += oneday

輸出結果：

20150917
20150918
20150919
20150920