time zone problems

[Erez D]

hi

erez at new53:~$ date
Sun Mar 29 11:14:50 IDT 2009
erez at new53:~$ date -d "GMT"
Sun Mar 29 03:00:00 IDT 2009
erez at new53:~$ date -d "IDT"
Sun Mar 29 00:00:00 IDT 2009

so i am 3 hours from GMT (as expected for israel daylight saving)


however:

struct tm time_str;
...
int d=timegm(&time_str)-timelocal(&time_str);
printf("%d\n",d);


prints 7200 (which is 2*3600 -> two hours).


any idea ?
or in in other words, how the f@#k i get the offset from GMT c-code ?


thanks,
erez.
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