从unix $ date

Question

我有unix日期的成对时间戳：

alvas@ubi:~$ date
Wed May 20 01:04:43 CEST 2015

如何计算时间戳对之间的时差？

注意：我没有来自$date的完整日期时间戳，而只有我日志文件中剩余hr:min:sec的时间。

例如，timediff(start, end)：

timediff('11:12:10', '19:58:50')
timediff('15:17:09', '03:11:10')

[OUT]：

31600
42841

[OUT2]：

8 hrs 46 mins 40 secs (31600 secs)
11 hrs 54 mins 1 secs (42841 secs)

如果是end < start，请将其视为第二天。

我已尝试过以下脚本，但有更简单的方法吗？

def timediff(start, end):
    start_hr, start_min, start_sec = map(float, start.split(':'))
    end_hr, end_min, end_sec = map(float, end.split(':'))

    if end_hr < start_hr:
        end_hr = end_hr + 24

    if end_min < start_min:
        end_min = end_min + 60
        end_hr -= 1

    if end_sec < start_sec:
        end_sec = end_sec + 60
        end_min -= 1

    num_hrs = end_hr - start_hr
    num_mins = end_min - start_min
    num_secs = end_sec - start_sec

    total_seconds = 60*60*num_hrs + 60*num_mins+num_secs

    total_time = " ".join([str(num_hrs), 'hrs', str(num_mins), 'mins', str(num_secs), 'secs'])

    return total_seconds, total_time




print timediff('11:12:10', '19:58:50')
print timediff('15:17:09', '03:11:10')

[OUT]：

(31600.0, '8.0 hrs 46.0 mins 40.0 secs')
(42841.0, '11.0 hrs 54.0 mins 1.0 secs')

当我尝试dateutil.parser.parse时：

>>> from dateutil.parser import parse as dtparse
>>> dtparse('19:58:50') - dtparse('11:12:10')
datetime.timedelta(0, 31600)
>>> dtparse('03:11:10') - dtparse('15:17:09')
datetime.timedelta(-1, 42841)

Answer 1

dateutil.parser（[）可以解析任何事情......及其时区感知

pip install python-dateutil

这里......如果您不知道以后哪个时间戳会有效......

from dateutil.parser import parse as dtparse
print dtparse("Wed May 20 01:04:43 CEST 2015") - dtparse("Wed May 20 00:02:43 CEST 2015")


>>> print dtparse("Fri May 22 01:04:43 CEST 2015") - dtparse("Wed May 20 00:02:43
CEST 2015")
2 days, 1:02:00

>>> print dtparse("15:22:36") - dtparse("12:00:45")
3:21:51 # 3 hours, 21 minutes, 51 seconds

如果您想在订单错误的情况下减去一天，请尝试此

def tdiff(t1,t2):
    if t1 > t2:t1,t2 = t2,t1
    return t2-t1

print tdiff(dtparse('11:12:10'), dtparse('19:58:50'))

Answer 2

可能更容易使用datetime：

import datetime

def timediff(t1, t2):
    d1=datetime.datetime.strptime(t1, "%H:%M:%S")
    d2=datetime.datetime.strptime(t2, "%H:%M:%S")
    if d2<d1:
        d1-=datetime.timedelta(days=1)

    return ((d2-d1).total_seconds(), str(d2-d1))

>>> timediff('11:12:10', '19:58:50')
(31600.0, '8:46:40')
>>> timediff('15:17:09', '03:11:10')
(42841.0, '11:54:01')