python datetime format quick reference table

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python (pyenv) installation memo

datetime

# -*- coding:utf-8 -*-
import datetime
from datetime import date,timedelta

#Current date and time
d = datetime.date.today() # 2019-08-01
print(d.strftime("%Y%m%d")) # 20190801
 
#Reference date
d = date(2019, 8, 01) # 2019-08-01
#The day before
yesterday = d - timedelta(days=1) # 2019-07-31
#20 days ago
before_20_days = d - timedelta(days=1) * 20 # 2019-07-12
#40 days ago
before_40_days = d - timedelta(days=40) # 2019-06-22
#2 weeks ago
two_weeks_ago = d + timedelta(weeks=-2) # 2019-07-18

Simplified chart

Code Meaning Example
%a Weekday as locale’s abbreviated name. Mon
%A Weekday as locale’s full name. Monday
%w Weekday as a decimal number, where 0 is Sunday and 6 is Saturday. 1
%d Day of the month as a zero-padded decimal number. 30
%-d Day of the month as a decimal number. (Platform specific) 30
%b Month as locale’s abbreviated name. Sep
%B Month as locale’s full name. September
%m Month as a zero-padded decimal number. 9
%-m Month as a decimal number. (Platform specific) 9
%y Year without century as a zero-padded decimal number. 13
%Y Year with century as a decimal number. 2013
%H Hour (24-hour clock) as a zero-padded decimal number. 7
%-H Hour (24-hour clock) as a decimal number. (Platform specific) 7
%I Hour (12-hour clock) as a zero-padded decimal number. 7
%-I Hour (12-hour clock) as a decimal number. (Platform specific) 7
%p Locale’s equivalent of either AM or PM. AM
%M Minute as a zero-padded decimal number. 6
%-M Minute as a decimal number. (Platform specific) 6
%S Second as a zero-padded decimal number. 5
%-S Second as a decimal number. (Platform specific) 5
%f Microsecond as a decimal number, zero-padded on the left. 0
%z UTC offset in the form +HHMM or -HHMM (empty string if the the object is naive).
%Z Time zone name (empty string if the object is naive).
%j Day of the year as a zero-padded decimal number. 273
%-j Day of the year as a decimal number. (Platform specific) 273
%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. 39
%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. 39
%c Locale’s appropriate date and time representation. Mon Sep 30 07:06:05 2013
%x Locale’s appropriate date representation. 9/30/2013
%X Locale’s appropriate time representation. 7:06:05
%% A literal '%' character. %

[reference] http://strftime.org/ http://docs.python.jp/2/library/datetime.html

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