一文带你吃透Python中的日期时间模块

import time

# 获取时间戳 返回的是浮点型
# 作用 用来计算时间差
print(time.time()) # 1676775733.1080997

# 获取当地时间   返回的是结构化时间
print(time.localtime())

#  获取UTC时间 返回的还是结构化时间  比中国时间少8小时
print(time.gmtime())

import time

# 获取本地时间
localtime = time.asctime(time.localtime(time.time()))
#localtime = time.asctime(time.localtime())
print("本地时间为 :", localtime) 
## 本地时间为 : Mon Feb 20 20:49:10 2023

# 时间转换为格式字符串
print(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()))
print(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time.time())))

# 格式字符串转换为时间
str = "2023-02-14 05:20:00"
print(time.strptime(str, "%Y-%m-%d %H:%M:%S"))

# 格式字符串转换为时间戳
print(time.mktime(time.strptime(str, "%Y-%m-%d %H:%M:%S")))

from datetime import datetime

# 获取时间 获取当前时间 并且返回的是格式化字符时间
now = datetime.now()
print(now)
print(type(now))
print(now.year)
print(now.month)
print(now.day)
print(now.hour)
print(now.minute)
print(now.second)
print(now.microsecond)

# 手动指定时间
print(datetime(2023, 2, 20, 20, 50, 00))

# 替换某个时间单位的值
print(now.replace(year=2024))

d1 = datetime.now()
d2 = datetime(2024, 2, 20, 20, 50, 00)
print(d1 - d2)  

from datetime import datetime

now = datetime.now()
# 强制转换字符串
print(str(now))

# 格式化日期 转换 字符串
print(now.strftime("%Y/%m/%d %H:%M:%S"))
print(now.strftime("%Y-%m-%d %H:%M:%S"))
print(now.strftime("%Y/%m/%d"))
print(now.strftime("%Y-%m-%d"))

dates = ['2022-02-20 20:23:35', '2024-02-20 20:23:35']
datelist = [datetime.strptime(i, "%Y-%m-%d %H:%M:%S") for i in dates]
print(datelist)
# [datetime.datetime(2022, 2, 20, 20, 23, 35), datetime.datetime(2024, 2, 20, 20, 23, 35)]

# 需要安装 pip install python-dateutil
from dateutil.parser import parse

print(parse('2/20/2023'))
print(parse('2023-2-20'))
print(parse('2023.2.20'))
print(parse('2023 2 4'))
print(parse('2023, 6, 2'))

import datetime

now = datetime.datetime.now()
print(now)

# 3天后
dt1 = now + datetime.timedelta(3)
print(dt1)

# 3天前
dt2 = now + datetime.timedelta(-3)
print(dt2)

# 3小时30秒后
dt3 = now + datetime.timedelta(hours=3, seconds=30)
print(dt3)

import calendar

# 打印指定某年的月历
print(calendar.month(2023, 5))

# 打印2023年历
# print(calendar.calendar(2023))