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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