python自学记录-日期相关

import datetime,time

#纪元时间戳:是个浮点数
print(time.time())

#获取当年时间，以年月日、时分秒格式
now=datetime.datetime.now()
print(now)

dt=datetime.datetime(2015,10,21,16,29,0)
print(dt)

print(dt.year)
print(dt.month)
print(dt.day)
print(dt.hour)
print(dt.minute)
print(dt.second)


#Unix纪元时间戳转为年月日时分秒格式
t=datetime.datetime.fromtimestamp(time.time())
print(t)

#datetime对象比较大小

time2025=datetime.datetime(2025,2,21,0,0,0)
time2024=datetime.datetime(2024,2,21,0,0,0)

print(time2025>time2024)
print(time2025<time2024)
print(time2025!=time2024)

#timedelta表示时间段
delta=datetime.timedelta(days=11,hours=10,minutes=9,seconds=8)
print(delta.days)
print(delta.seconds)
print(delta.microseconds)

print(delta.total_seconds())
print(str(delta))

#日期计算

#计算从当前日期后1000天的日期
dt=datetime.datetime.now()
thousandDays=datetime.timedelta(days=1000)
futureday=dt+thousandDays
print(str(futureday))

#计算从当前日期开算的30年后的日期
aboutThirtyYear=datetime.timedelta(days=365*30)
futureday=dt+aboutThirtyYear
print(str(futureday))

now=futureday-aboutThirtyYear
print(str(now))

import datetime,time

#到17:00提示下班打卡

workofftime=datetime.datetime(2025,3,19,17,00,00)
while datetime.datetime.now()<workofftime:
	time.sleep(1)
print('下班，打卡，走人')

import datetime,time

#datetime转字符串
dt=datetime.datetime(2025,3,19,16,58,10)
fdt=dt.strftime('%Y/%m/%d %H:%M:%S')
print(fdt)

#字符串转datetime
time01=datetime.datetime.strptime('October 21,2025','%B %d,%Y')
print(time01)
time02=datetime.datetime.strptime('2025/02/22 16:23:00','%Y/%m/%d %H:%M:%S')
print(time02)