Setting 'struct tm' tm_zone="GMT" doesn't work, takes default system timezone

Dear Dev-Meisters,
I'm trying to find out why setting tm_zone="GMT" in a "struct tm" is not working on Mac OS X 10.6.x. and mktime()....
However with gmtime() it works but apparently it's not recommended for Mac OS X...
I need to read in a data file with large datasets which contains date / time along with data.
Every date/time (can be about > 500000 lines) is converted to a time_t data structure to find out if there a gaps between dates.
However setting the structure "struct tm" with tm_zone="GMT" doesn't set it to GMT.
It always takes Mac OS X default time zone defined in the Sys Preferences.
I made succesful tests with "NSDate timeIntervalSince1970" (when setting the NSTimezone to GMT): this gives the correct GMT time...
Since > 500000 lines is a little bit overkill performance wise to always create an object I would prefer to use UNIX time stamp...
/* Test for 24 Feb. 2005 at 17h20:10 / Should return: 1109265610 as UTC time */
time_t currentTime;
struct tm myTm;
myTm.tm_year          = 2005-1900; // need to subtract -1900
myTm.tm_mon           = 2-1;        // need to subtract -1 (since month: 0-11)
myTm.tm_mday          = 24;
myTm.tm_hour          = 17;
myTm.tm_min           = 20;
myTm.tm_sec           = 10;
myTm.tm_zone          = "GMT";
myTm.tm_isdst         = 0; // DayLight Saving Time flag = 0 = Off
myTm.tm_gmtoff        = 0;
currentTime = mktime(&myTm);
Result on Mac OS X: 1109262010 !! Wrong result: -3600 seconds, should be 1109265610
However using:
currentTime = gmtime(&myTm);
gives the right result: 1109265610
Any suggestions is greatly appreciated

Thanks for the answer, I read everything except the man page for mktime :-(
Well I can't remember where I read that about "gmtime" but you are right:
I will use gmtime instead of mktime and it works, it converts it to a GMT time.
Thanks again for your precious help.
Cheers,
Gilles

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