[Boost-bugs] [Boost C++ Libraries] #10285: local_time is not monotonic

Subject: [Boost-bugs] [Boost C++ Libraries] #10285: local_time is not monotonic
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-08-01 08:03:44

#10285: local_time is not monotonic
-----------------------------------------+------------------------
 Reporter:  Gaetano Mendola <mendola@…>  |      Owner:  az_sw_dude
     Type:  Bugs                         |     Status:  new
Milestone:  To Be Determined             |  Component:  date_time
  Version:  Boost 1.55.0                 |   Severity:  Problem
 Keywords:                               |
-----------------------------------------+------------------------
 The following snippet seems to generate non monotonic local_date.

 I'm using boost 1.55 on linux.

 #include <boost/date_time/local_time/local_time.hpp>
 #include <boost/ptr_container/ptr_vector.hpp>

 int main() {
   const boost::local_time::time_zone_ptr theTimeZone(
     new boost::local_time::posix_time_zone(
           "CET+01CEST+01,M3.5.0/02:00,M10.5.0/03:00")
   );

   boost::local_time::local_date_time myOldValue(
     boost::local_time::local_microsec_clock::local_time(theTimeZone));

   for (size_t i = 0; ; ++i) {
     const boost::local_time::local_date_time myLocalTime =
         boost::local_time::local_microsec_clock::local_time(theTimeZone);

     if (myLocalTime < myOldValue) {
       std::cout << myOldValue << std::endl;
       std::cout << myLocalTime << std::endl;
       std::cout <<
 boost::local_time::local_microsec_clock::local_time(theTimeZone) <<
 std::endl;
       std::cout << "====================" << std::endl;
     }

     myOldValue = myLocalTime;
   }
 }

 As you can see the program is not supposed to print anything ever,
 however this is what I'm getting:


 2014-Jul-31 00:24:56.005625 CEST
 2014-Jul-31 00:24:55.005631 CEST     <== 1 second back
 2014-Jul-31 00:24:56.005946 CEST
 ====================
 2014-Jul-31 00:24:58.005625 CEST
 2014-Jul-31 00:24:57.005629 CEST     <== 1 second back
 2014-Jul-31 00:24:58.005824 CEST
 ====================
 2014-Jul-31 00:25:02.005624 CEST
 2014-Jul-31 00:25:01.005628 CEST     <== 1 second back
 2014-Jul-31 00:25:02.005838 CEST
 ====================
 2014-Jul-31 00:25:04.005625 CEST
 2014-Jul-31 00:25:03.005630 CEST     <== 1 second back
 2014-Jul-31 00:25:04.005826 CEST
 ====================
 2014-Jul-31 00:25:06.005624 CEST
 2014-Jul-31 00:25:05.005633 CEST     <== 1 second back
 2014-Jul-31 00:25:06.005853 CEST
 ====================
 2014-Jul-31 00:25:07.005625 CEST
 2014-Jul-31 00:25:06.005631 CEST     <== 1 second back
 2014-Jul-31 00:25:07.005846 CEST
 ====================
 2014-Jul-31 00:25:12.005625 CEST
 2014-Jul-31 00:25:11.005631 CEST     <== 1 second back
 2014-Jul-31 00:25:12.005822 CEST
 ====================

 as you can see when the local_date is near 0.005631 second fraction it
 goes back of one second and then forward again on the following call.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/10285>
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