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
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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