> > > How about having some #if BROKEN_TIMEZONE_DATABASE code which uses both > > > mktime() and localtime() to derive the correct time zone? That is, call > > > mktime to get a time_t, then call localtime() to get the time zone info, > > > but only on platforms which do not get a complete result from just the > > > call to mktime(). In fact, we *could* check for tm->tm_isdst coming back > > > "-1" for every platform, then call localtime() to make a last stab at > > > getting a good value. > > How would we construct a valid time_t from the struct tm > without mktime? > > If I understand the info you have given previously, it should be > possible to get a valid tm->tm_isdst by the following > sequence of calls: > > // call mktime() which might return a "-1" for DST > time = mktime(tm); > // time is now a correct GMT time Unfortunately the returned time is -1 for all dates before 1970 (on AIX and, as I understood, IRIX) :-( (can you send someone from IBM, that I can shout at, to releive my anger) Andreas
