方法1：从系统datetime获取当前日期和时间

datetime模块提供用于操作日期和时间的类。

密码

from datetime import datetime,date

print("Date: "+str(date.today().year)+"-"+str(date.today().month)+"-"+str(date.today().day))
print("Year: "+str(date.today().year))
print("Month: "+str(date.today().month))
print("Day: "+str(date.today().day)+"\n")

print("Time: "+str(datetime.today().hour)+":"+str(datetime.today().minute)+":"+str(datetime.today().second))
print("Hour: "+str(datetime.today().hour))
print("Minute: "+str(datetime.today().minute))
print("Second: "+str(datetime.today().second))
print("MilliSecond: "+str(datetime.today().microsecond))

输出将如下

Date: 2020-4-18
Year: 2020
Month: 4
Day: 18

Time: 19:30:5
Hour: 19
Minute: 30
Second: 5
MilliSecond: 836071

方法2：如果网络可用，则获取当前日期和时间

urllib包帮助我们处理url，即网页。这里我们从网页收集数据http://just-the-time.appspot.com/并使用包日期解析器从网页解析日期时间。

密码

from urllib.request import urlopen
import dateparser

time_url = urlopen(u'http://just-the-time.appspot.com/')
datetime = time_url.read().decode("utf-8", errors="ignore").split(' ')[:-1]
date = datetime[0]
time = datetime[1]

print("Date: "+str(date))
print("Year: "+str(date.split('-')[0]))
print("Month: "+str(date.split('-')[1]))
print("Day: "+str(date.split('-')[2])+'\n')

print("Time: "+str(time))
print("Hour: "+str(time.split(':')[0]))
print("Minute: "+str(time.split(':')[1]))
print("Second: "+str(time.split(':')[2]))

输出将如下

Date: 2020-04-18
Year: 2020
Month: 04
Day: 18

Time: 14:17:10
Hour: 14
Minute: 17
Second: 10

方法3：从机器的本地时间获取当前日期和时间

Python的时间模块提供了一个函数，用于从称为localtime（）的历元起经过的秒数获取本地时间。ctime（）函数将从epoch开始经过的秒数作为参数，并返回表示本地时间的字符串。

密码

from time import time, ctime
datetime = ctime(time()).split(' ')

print("Date: "+str(datetime[4])+"-"+str(datetime[1])+"-"+str(datetime[2]))
print("Year: "+str(datetime[4]))
print("Month: "+str(datetime[1]))
print("Day: "+str(datetime[2]))
print("Week Day: "+str(datetime[0])+'\n')

print("Time: "+str(datetime[3]))
print("Hour: "+str(datetime[3]).split(':')[0])
print("Minute: "+str(datetime[3]).split(':')[1])
print("Second: "+str(datetime[3]).split(':')[2])

输出将如下

Date: 2020-Apr-18
Year: 2020
Month: Apr
Day: 18
Week Day: Sat

Time: 19:30:20
Hour: 19
Minute: 30
Second: 20

使用日期时间：

>>> import datetime
>>> now = datetime.datetime.now()
>>> now
datetime.datetime(2009, 1, 6, 15, 8, 24, 78915)
>>> print(now)
2009-01-06 15:08:24.789150

对于没有日期的时钟时间：

>>> now.time()
datetime.time(15, 8, 24, 78915)
>>> print(now.time())
15:08:24.789150

要保存键入，可以从datetime模块导入datetime对象：

>>> from datetime import datetime

然后删除前缀datetime。从以上所有方面来看。

与Harley的答案类似，但使用str（）函数实现一种更快速、更易于阅读的格式：

>>> from datetime import datetime
>>> str(datetime.now())
'2011-05-03 17:45:35.177000'

>>> import datetime, time
>>> time = time.strftime("%H:%M:%S:%MS", time.localtime())
>>> print time
'00:21:38:20S'

为什么不问问美国海军的官方计时员美国海军天文台？

import requests
from lxml import html

page = requests.get('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
tree = html.fromstring(page.content)
print(tree.xpath('//html//body//h3//pre/text()')[1])

如果你住在华盛顿地区（像我一样），延迟可能不会太差。。。

import datetime
import pytz # for timezone()
import time

current_time1 = datetime.datetime.now()
current_time2 = datetime.datetime.now(pytz.timezone('Asia/Taipei'))
current_time3 = datetime.datetime.utcnow()
current_time4 = datetime.datetime.now().isoformat()
current_time5 = time.gmtime(time.time())

print("datetime.datetime.now():", current_time1)
print("datetime.datetime.now(pytz.timezone('Asia/Taipei')):", current_time2)
print("datetime.utcnow():", current_time3)
print("datetime.datetime.now().isoformat():", current_time4)
print('time.gmtime(time.time()): ', current_time5)