[Boost-bugs] [Boost C++ Libraries] #11813: Microseconds get cut off in ISO string representation if all zero (posix_time::to_iso_string)

Subject: [Boost-bugs] [Boost C++ Libraries] #11813: Microseconds get cut off in ISO string representation if all zero (posix_time::to_iso_string)
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2015-11-21 14:33:17

#11813: Microseconds get cut off in ISO string representation if all zero
(posix_time::to_iso_string)
-------------------------------------+-------------------------------------
 Reporter:  Marcel Glacki <boost-    |       Type:  Bugs
  trac@…>                            |  Milestone:  To Be Determined
   Status:  new                      |    Version:  Boost 1.55.0
Component:  None                     |   Keywords:  posix_time microseconds
 Severity:  Problem                  |  to_iso_string
-------------------------------------+-------------------------------------
 {{{
 #include <iostream>
 #include <string>
 #include <boost/date_time/posix_time/posix_time.hpp>


 int main()
 {
     boost::posix_time::ptime timestamp =
 boost::posix_time::microsec_clock::local_time();
     std::string sTime( boost::posix_time::to_iso_string( timestamp ));
     std::cout << "Timestamp: " << sTime << std::endl;
     return 0;
 }
 }}}

 This outputs for example: ''Timestamp: 20151121T141522.999982''

 Now, if microseconds are all zero the output I'd expected was[[BR]]
 ''Timestamp: 20151121T141523.000000''[[BR]]
 but actually is[[BR]]
 ''Timestamp: 20151121T141523''

 Now, when trying to cut off the microseconds fraction (for whatever
 reason) by doing
 {{{
 std::string sFraction = sTime.substr( 16, 21 );
 }}}
 you may end up with the following error:
 {{{
 Something unexpected happened: 'basic_string::substr: __pos (which is 16)
 > this->size() (which is 15)'
 }}}


 I saw this behavior in Boost 1.55.0, but when I checked the current
 sources online, I couldn't see any difference, so I think this would occur
 in the current version, too.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11813>
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