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Emulate the behavior of the USG UNIX 'daylight' and 'timezone' variables
where not implemented.
int daylight: Zero if the time zone does not have any daylight saving time
rules and non-zero if there is a time during the year when daylight saving
time applies. [1] On FreeBSD, tzname[1] should be set to " " (three spaces)
if DST is never observed. [2]
long int timezone: contains the difference between UTC and the latest local
standard time, in seconds west of UTC. For example, in the U.S. Eastern time
zone, the value is 5*60*60. Unlike the tm_gmtoff member of the broken-down
time structure, this value is not adjusted for daylight saving, and its sign
is reversed. [1]
After [3], use the base implementations of 'daylight' and 'timezone'.
[1] https://www.gnu.org/software/libc/manual/html_node/Time-Zone-Functions.html#Time-Zone-Functions
[2] https://cgit.freebsd.org/src/tree/contrib/tzcode/stdtime/localtime.c?id=9436aa0e668b147c9a5bf1898ef091934c676434#n84
[3] https://cgit.freebsd.org/src/commit/?id=a34940a9756ac8edce36fec176949ee82e9235b4
--- lib/FXSystemTime.cpp.orig 2024-06-30 15:47:37 UTC
+++ lib/FXSystemTime.cpp
@@ -264,8 +264,11 @@ FXTime FXSystem::localTimeZoneOffset(){
setuplocaltimezone();
#if defined(WIN32)
return minutes*tzi.Bias; // +minutes*tzi.StandardBias;
-#elif defined(__FreeBSD__) || defined(__OpenBSD__)
- return 0; // FIXME
+#elif defined(__FreeBSD__) && __FreeBSD_version < 1500015 || defined (__OpenBSD__)
+ struct tm tmresult;
+ time_t tmp=time(&tmp);
+ struct tm* ptm=localtime_r(&tmp,&tmresult);
+ return seconds*(-ptm->tm_gmtoff + ptm->tm_isdst*3600);
#else
return seconds*timezone;
#endif
@@ -277,8 +280,8 @@ FXTime FXSystem::daylightSavingsOffset(){
setuplocaltimezone();
#if defined(WIN32)
return minutes*tzi.DaylightBias; // Or difference between standard and daylight bias.
-#elif defined(__FreeBSD__) || defined(__OpenBSD__)
- return 0; // FIXME
+#elif defined(__FreeBSD__) && __FreeBSD_version < 1500015 || defined (__OpenBSD__)
+ return -hours*((tzname[1][0] == ' ') ? 0 : 1);
#else
return -hours*daylight;
#endif
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