python 时间戳转换，求时间差等常见用法

项目github地址：bitcarmanlee easy-algorithm-interview-and-practice
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1.常用的模块

from datetime import datetime
import time
from dateutil.parser import parse

2.得到当前时间

def getCurrentTime():
    now = datetime.now()
    print(now)
    print(type(now))

结果为

2020-05-07 09:39:02.318002
<class 'datetime.datetime'>

3.得到datetime对象

def genDateTimeObj():
    date = datetime(2020, 4, 19, 15, 30)
    print(date)
    print(type(date))

2020-04-19 15:30:00
<class 'datetime.datetime'>

4.datetime转时间戳

def datetime_2_timestamp():
    now = datetime.now()
    now_timetuple = now.timetuple()
    now_second = time.mktime(now_timetuple)
    now_millisecond =  int (now_second * 1000 + now.microsecond / 1000)

    print(now.timestamp())
    print(now_millisecond)

1588815680.100948
1588815680100

注意如果直接用timestamp()方法得到的是一个浮点数，且时间戳是十位，单位为秒。下面的方法得到的时间戳为十三位，毫秒。

5.时间戳转datetime

def timestamp_2_datetime():
    timestamp = 1588761521787 / 1000
    date = datetime.fromtimestamp(timestamp)
    print(date)

2020-05-06 18:38:41.787000

6.datetime转字符串

def datetime_2_str():
    now = datetime.now()
    date = now.strftime('%Y-%m-%d %H:%M:%S')
    print(date)

2020-05-07 09:44:22

7.字符串转datetime

def str_2_datetime():
    datestr = "2020-05-06 18:42:26"
    date = datetime.strptime(datestr, "%Y-%m-%d %H:%M:%S")
    print(date)
    print(type(date))

2020-05-07 09:44:22

8.求两个时间差

def get_interview():
    t1 = "2020-05-05 23:56:45"
    t2 = "2020-05-06 00:00:31"
    date1 = parse(t1)
    date2 = parse(t2)
    result = (date2 - date1).total_seconds()
    print(result)

226.0

上面的方法，求得的是两个时间之间差的秒数。