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timedelta problem

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In the python doc , https://docs.python.org/3.4/library/datetime.html

A timedelta 
<https://docs.python.org/3.4/library/datetime.html#datetime.timedelta> 
object represents a duration, the difference between two dates or times.

/class /datetime.timedelta(/days=0/, /seconds=0/, /microseconds=0/, 
/milliseconds=0/, /minutes=0/, /hours=0/, /weeks=0/)

    All arguments are optional and default to 0. Arguments may be
    integers or floats, and may be positive or negative.

    Only /days/, /seconds/ and /microseconds/ are stored internally.

import datetime
t1='Sat, 09 Aug 2014 07:36:46 -0700'
t2='Sat, 09 Aug 2014 07:36:46 +0700'
 >>> datetime.datetime.strptime(t1,"%a, %d %b %Y %H:%M:%S %z")
datetime.datetime(2014, 8, 9, 7, 36, 46, 
tzinfo=datetime.timezone(datetime.timed
elta(-1, 61200)))
 >>> datetime.datetime.strptime(t2,"%a, %d %b %Y %H:%M:%S %z")
datetime.datetime(2014, 8, 9, 7, 36, 46, 
tzinfo=datetime.timezone(datetime.timed
elta(0, 25200)))


problem :

t1 is GMT time   2014  00:36:46
t2 is GMT time   2014  14:36:46

datetime.datetime.strptime  do not give me the right answer.

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timedelta  problem luofeiyu <elearn2014@gmail.com> - 2014-08-15 10:24 +0800
  Re: timedelta  problem Denis McMahon <denismfmcmahon@gmail.com> - 2014-08-15 03:51 +0000
    Re: timedelta problem Chris Angelico <rosuav@gmail.com> - 2014-08-15 13:59 +1000
    Re: timedelta problem Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-14 22:00 -0600
  Re: timedelta  problem Denis McMahon <denismfmcmahon@gmail.com> - 2014-08-15 07:39 +0000
    Re: timedelta  problem Denis McMahon <denismfmcmahon@gmail.com> - 2014-08-15 08:44 +0000
    Re: timedelta problem Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-15 09:23 -0600
      Re: timedelta problem Denis McMahon <denismfmcmahon@gmail.com> - 2014-08-15 17:43 +0000
        Re: timedelta problem Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-15 12:05 -0600
    Re: timedelta problem Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-15 17:29 +0100
  Re: timedelta  problem Denis McMahon <denismfmcmahon@gmail.com> - 2014-08-15 09:36 +0000

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