[Boost-bugs] [Boost C++ Libraries] #3336: utc offset calculated wrong

Subject: [Boost-bugs] [Boost C++ Libraries] #3336: utc offset calculated wrong
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-08-11 16:13:27

#3336: utc offset calculated wrong
----------------------------------+-----------------------------------------
 Reporter:  silvan@…              |       Owner:         
     Type:  Bugs                  |      Status:  new    
Milestone:  Boost 1.40.0          |   Component:  None   
  Version:  Boost 1.38.0          |    Severity:  Problem
 Keywords:                        |  
----------------------------------+-----------------------------------------
 Boost seems to invert the posix time zone specs or even worse to calculate
 them completely wrong:

 [http://www.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html]

 states:

 "If preceded by a '-', the timezone shall be east of the Prime Meridian;
 otherwise, it shall be west (which may be indicated by an optional
 preceding '+' )."

 Using the following lines in a c++ program:

 {{{
   time_zone_ptr myzone(new posix_time_zone(string("CET-
 1CEST,M3.5.0,M10.5.0/3"))); // e.g. Europe/Berlin
   cout << "Posix time string: " << myzone->to_posix_string() << endl;
   local_date_time mylocaltime(date(2009,8,11), time_duration(17,0,0),
 myzone, true);
   cout << "Wall clock: " << mylocaltime.local_time() << endl;
   cout << "Time in UTC: " << mylocaltime.utc_time() << endl;
 }}}

 gives following output: [[BR]]
 Posix time string: CET-01CEST+01,M3.5.0/02:00,M10.5.0/03:00 [[BR]]
 Wall clock: 2009-Aug-11 17:00:00 [[BR]]
 Time in UTC: 2009-Aug-11 17:00:00 [[BR]]

 The system I used: Debian GNU/Linux squeeze/sid [[BR]]
 uname -a[[BR]]
 Linux fafner 2.6.28.7 #1 SMP Mon Mar 16 17:39:15 CET 2009 i686 GNU/Linux

 output from date:[[BR]]
 date -d "2009-8-11 17:00 CEST "[[BR]]
 Di 11. Aug 17:00:00 CEST 2009[[BR]]
 date -d "2009-8-11 17:00 CEST " -u[[BR]]
 Di 11. Aug 15:00:00 UTC 2009

 Libraries (debian):
 libboost-date-time1.38.0
 libboost-date-time1.38-dev
 libboost-date-time-dev

 The time zone spec ist taken from /usr/share/zoneinfo/CET on my system.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3336>
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