boost::gregorian::to_tm() does not fill in tm_gmtoff and tm_zone fields of the resulting std::tm structure

[izimenkov@…]

On Fedora 15 (and maybe on other OSes), std::tm contains fields describing the time zone:

#ifdef	__USE_BSD
  long int tm_gmtoff;		/* Seconds east of UTC.  */
  __const char *tm_zone;	/* Timezone abbreviation.  */
#else
  long int __tm_gmtoff;		/* Seconds east of UTC.  */
  __const char *__tm_zone;	/* Timezone abbreviation.  */
#endif

boost::gregorian::to_tm() (and boost::posix_time::to_tm() respectively) does not fill in these fields. So these fields contain garbage. Other code can be misleaded with values of these uninitialized fields.