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Python處理日期和時(shí)間的方法總結(jié)_python

作者：電力系統(tǒng)與算法之美 ? 更新時(shí)間： 2022-06-01 編程語(yǔ)言

1 簡(jiǎn)單入門

1.1 獲取當(dāng)前時(shí)間

import datetime
 
datetime_object = datetime.datetime.now()
print(datetime_object)

輸出

2022-03-29 16:36:44.749582
?
Process finished with exit code 0

1.2 獲取當(dāng)前日期

import datetime
 
date_object = datetime.date.today()
print(date_object)

輸出

2022-03-29
?
Process finished with exit code 0

1.3 datetime中的類

import datetime
 
print(dir(datetime))

輸出

?['MAXYEAR', 'MINYEAR', '__all__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', 'date', 'datetime', 'datetime_CAPI', 'sys', 'time', 'timedelta', 'timezone', 'tzinfo']
?
Process finished with exit code 0

2 datetime中的常用的類

  • date類
  • time類
  • datetime類
  • timedelta類

2.1 ?date類

（1）示例化date對(duì)象

import datetime
 
d = datetime.date(2022, 3, 29)
print(d)

輸出

2022-03-29
?
Process finished with exit code 0

（2）獲取當(dāng)前日期?

from datetime import date
 
today = date.today()
 
print("當(dāng)前日期 =", today)

輸出

當(dāng)前日期 = 2022-03-29
?
Process finished with exit code 0

（3）從時(shí)間戳獲取日期?

我們還可以從時(shí)間戳創(chuàng)建日期對(duì)象。Unix時(shí)間戳是特定日期到UTC的1970年1月1日之間的秒數(shù)。可以使用fromtimestamp()方法將時(shí)間戳轉(zhuǎn)換為日期。

from datetime import date
 
timestamp = date.fromtimestamp(1576244364)
print("日期 =", timestamp)

輸出

日期 = 2019-12-13
?
Process finished with exit code 0

（4）打印今天的年，月和日?

from datetime import date
 
# 今天的日期對(duì)象
today = date.today() 
 
print("當(dāng)前年:", today.year)
print("當(dāng)前月:", today.month)
print("當(dāng)前日:", today.day)

輸出?

當(dāng)前年: 2022
當(dāng)前月: 3
當(dāng)前日: 29
?
Process finished with exit code 0

2.2 time類?

（1）從time類示例化的時(shí)間對(duì)象表示本地時(shí)間。

from datetime import time
 
# time(hour = 0, minute = 0, second = 0)
a = time()
print("a =", a)
 
# time(hour, minute and second)
b = time(11, 34, 56)
print("b =", b)
 
# time(hour, minute and second)
c = time(hour = 11, minute = 34, second = 56)
print("c =", c)
 
# time(hour, minute, second, microsecond)
d = time(11, 34, 56, 234566)
print("d =", d)

輸出?

a = 00:00:00
b = 11:34:56
c = 11:34:56
d = 11:34:56.234566
?
Process finished with exit code 0

（2）打印時(shí)，分，秒和微秒?

from datetime import time
 
a = time(11, 34, 56)
 
print("小時(shí)=", a.hour)
print("分鐘=", a.minute)
print("秒=", a.second)
print("微秒=", a.microsecond)

輸出?

小時(shí)= 11
分鐘= 34
秒= 56
微秒= 0
?
Process finished with exit code 0

2.3 datetime類?

（1）datetime模塊有一個(gè)名為的dateclass類，可以包含來自date和time對(duì)象的信息。

from datetime import datetime
 
#datetime(year, month, day)
a = datetime(2019, 11, 28)
print(a)
 
# datetime(year, month, day, hour, minute, second, microsecond)
b = datetime(2019, 11, 28, 23, 55, 59, 342380)
print(b)

輸出?

2019-11-28 00:00:00
2019-11-28 23:55:59.342380
?
Process finished with exit code 0

（2）打印年，月，時(shí)，分和時(shí)間戳?

from datetime import datetime
 
a = datetime(2022, 3, 29, 23, 55, 59, 342380)
print("年 =", a.year)
print("月 =", a.month)
print("日 =", a.day)
print("時(shí) =", a.hour)
print("份 =", a.minute)
print("時(shí)間戳 =", a.timestamp())

輸出?

年 = 2022
月 = 3
日 = 29
時(shí) = 23
份 = 55
時(shí)間戳 = 1648569359.34238
?
Process finished with exit code 0

2.4 datetime.timedelta類

（1）timedelta對(duì)象表示兩個(gè)日期或時(shí)間之間的時(shí)差。?

from datetime import datetime, date
 
t1 = date(year = 2018, month = 7, day = 12)
t2 = date(year = 2017, month = 12, day = 23)
t3 = t1 - t2
print("t3 =", t3)
 
t4 = datetime(year = 2018, month = 7, day = 12, hour = 7, minute = 9, second = 33)
t5 = datetime(year = 2019, month = 6, day = 10, hour = 5, minute = 55, second = 13)
t6 = t4 - t5
print("t6 =", t6)
 
print("type of t3 =", type(t3)) 
print("type of t6 =", type(t6))

輸出?

t3 = 201 days, 0:00:00
t6 = -333 days, 1:14:20
type of t3 = <class 'datetime.timedelta'>
type of t6 = <class 'datetime.timedelta'>
?
Process finished with exit code 0

?（2）兩個(gè)timedelta對(duì)象之間的時(shí)間差

from datetime import timedelta
 
t1 = timedelta(weeks = 2, days = 5, hours = 1, seconds = 33)
t2 = timedelta(days = 4, hours = 11, minutes = 4, seconds = 54)
t3 = t1 - t2
 
print("t3 =", t3)

輸出?

t3 = 14 days, 13:55:39
?
Process finished with exit code 0

原文鏈接：https://blog.csdn.net/weixin_46039719/article/details/123825160

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