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I have used Tzedit utility to activate DST from June to August 31st in windowa xp. it works fine but
when i use tm structure to papulate with time values and set .tm_isdt = -1 and call mktime method , it
does not result the correct no of seconds. ie
time_t StartSeconds;
struct tm StartTime;
StartTime.tm_year = 2008 -1900;
StartTime.tm_mon = 6 -1;
StartTime.tm_mday = 6;
StartTime.tm_hour = 12;
StartTime.tm_min = 10;
StartTime.tm_sec = 0;
StartTime.tm_isdst = -1;
StartSeconds = mktime(&StartTime);
it gives me the value 1212736200 instead of 1212732600 although the DST is activated. ok but I want to keep the .tm_isdst = -1 and it should know that whether DST is ON or OFF and what is its Daylight Bias.
if I keep .tm_isdst = +1 it means that DST is ON and daylight Bias = -60
but if change the daylight setting ( by changing DaylightBias = -120 or +60) or OFF the DST then the .tm_isdst value must be changed which is rather static solution. I still cannot understand what you want.
If you want to somehow set DST then you must set tm_isdst to some positive number.
If you want use the standard time then you must set it to 0.
But if you set it to a value less than zero then: