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 %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, 以週日為一周開始 %w weekday as decimal number (0 - 6; sunday is 0) 週內星期索引，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, 以周一為一周開始 %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**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**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

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