void Date_convertToTimeZone_(Date *self, struct timezone tz)
{
double s = Date_asSeconds(self) +
((self->tz.tz_minuteswest - tz.tz_minuteswest) * 60);
Date_fromSeconds_(self, s);
Date_setTimeZone_(self, tz);
}
void Date_convertToTimeZone_(Date *self, struct timezone tz)
{
double s = Date_asSeconds(self) + 60*(self->tz.tz_minuteswest - (self->tz.tz_dsttime ? 60 : 0)) - 60*(tz.tz_minuteswest - (tz.tz_dsttime ? 60 : 0));
Date_fromSeconds_(self, s);
Date_setTimeZone_(self, tz);
}
IO_METHOD(IoDate, setGmtOffset)
{
/*doc Date setGmtOffset
Set the number of minutes west of GMT for this Date's zone
*/
struct timezone tz = Date_timeZone(DATA(self));
tz.tz_minuteswest = IoMessage_locals_intArgAt_(m, locals, 0);
Date_setTimeZone_(DATA(self), tz);
IoObject_isDirty_(self, 1);
return self;
}
IO_METHOD(IoDate, setToUTC)
{
/*doc Date asUTC
Changes the timezone of this date to utc
*/
struct timezone tz;
tz.tz_minuteswest = 0;
tz.tz_dsttime = 0;
Date_setTimeZone_(DATA(self), tz);
IoObject_isDirty_(self, 1);
return self;
}
