Python Python中的时间包1 datetime

Python中的时间包 detetime

• 日期与时间的结合体 -date and time
• 获取当前时间
• 获取时间间隔
• 将时间对象转换成时间字符串
• 将字符串转成时间类型

detetime包的常用功能

获取当前时间

导入包与模块

• from datetime import datetime
• import datetime

使用方法

• datetime.now()

• datetime.datetime.now() (today)

• 返回当前年月日时分秒毫秒的datetime对象

获取时间间隔

导入包

from datetime import datetime
from datetime import timedelta

使用方法

timeobj = timedelta(days=0, seconds=0, microsenconds=0, milliseconds=0, minutes=0, hours=0, week=0)

datetime包中的常用方法

时间对象转字符串

获取对象时间

from datetime import datetime
now = datetime.datetime.now()

时间转字符串

date_str = now.strftime(format)

时间字符串转时间类型

获取时间模块

from datetime import datetime

时间字符串转时间类型

datetime.strptime(tt, format)

参数介绍

• tt: 符合时间格式的字符串
• format: tt时间字符串匹配规则

python的常用时间格式化符号1

python的常用时间格式化符号2

代码

# 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'))