detetime
-date and time
detetime
包的常用功能from datetime import datetime
import datetime
datetime.now()
datetime.datetime.now() (today)
from datetime import datetime
from datetime import timedelta
timeobj = timedelta(days=0, seconds=0, microsenconds=0, milliseconds=0, minutes=0, hours=0, week=0)
datetime
包中的常用方法from datetime import datetime
now = datetime.datetime.now()
date_str = now.strftime(format)
from datetime import datetime
datetime.strptime(tt, format)
tt
: 符合时间格式的字符串format
: tt时间字符串匹配规则常用时间格式化符号
1字符 | 介绍 |
---|---|
%Y | 完整的年份,如2021 |
%m | 月份,1~12 |
%d | 月中的某一天(1~31) |
%H | 一天中的第几个小时(24小时,00~23) |
%I | 一天中的第几个小时(12小时,00~12) |
%M | 当前的第几分(00~59) |
%S | 当前的第几秒(0~61)闰年多占2秒 |
%f | 当前秒的第多少毫秒 |
常用时间格式化符号
2字符 | 介绍 |
---|---|
%a | 简化的星期,如星期三 Wed |
%A | 完整的星期,如星期三 Wednesday |
%b | 简化的月份,如二月 Fab |
%B | 完整的月份,如二月 Fabruary |
%c | 本地的日期和时间,如Web Fab 5 10:14:49 2020 |
%p | 显示上午还是下午,如AM代表上午,PM代表下午 |
%j | 一年中的第几天 |
%U | 一年中的星期数 |
# coding:utf-8
from datetime import datetime
from datetime import timedelta
now = datetime.now()
print(now, type(now))
now_str = now.strftime('%Y-%m-%d %H:%M:%S')
print(now_str, type(now_str))
now_obj = datetime.strptime(now_str, '%Y-%m-%d %H:%M:%S')
print(now_obj, type(now_obj), '-----')
three_days = timedelta(days=3)
after_three_day = now + three_days
print(after_three_day)
after_three_day_str = after_three_day.strftime('%Y/%m/%d %H:%M:%S')
print(after_three_day_str, type(after_three_day_str))
after_three_day_obj = datetime.strptime(after_three_day_str, '%Y/%m/%d %H:%M:%S')
print(after_three_day_obj, type(after_three_day_obj), '-----')
before_three_day = now - three_days
print(before_three_day)
before_three_day_str = before_three_day.strftime('%Y%m%d')
print(before_three_day_str, type(before_three_day_str))
before_three_day_obj = datetime.strptime(before_three_day_str, '%Y%m%d')
print(before_three_day_obj, type(before_three_day_obj), '-------')
one_hour = timedelta(hours=1)
before_one_hour = now - one_hour
print(before_one_hour)
before_one_hour_str = before_one_hour.strftime('%H:%M:%S')
print(before_one_hour_str, type(before_three_day_str))
# default_str = '2020 12 abc'
# print(datetime.strptime(default_str, '%Y %m'))