To C geeks: Could someone who has freetime on their linux system compile the following C program and see if they can duplicate these results? I found a strange 422 second difference between the 2 times.
mktime-discrepancy.c ----------------------------------------- #include <time.h> #include <stdio.h> #include <string.h> int main() { char pacific_timezone[8] = "PST8PDT"; char * timezone = &pacific_timezone[0]; // Date: November 18, 1883 12:07:01 am PST struct tm first_tm; first_tm.tm_sec = 01; first_tm.tm_min = 07; first_tm.tm_hour = 12; first_tm.tm_mday = 18; first_tm.tm_mon = 10; // November first_tm.tm_year = -17; // 1883 first_tm.tm_wday = 0; // Sunday first_tm.tm_yday = 321; first_tm.tm_isdst = 0; first_tm.tm_gmtoff = -28800; first_tm.tm_zone = timezone; // Date: November 18, 1883 12:07:02 am PST struct tm second_tm; second_tm.tm_sec = 02; second_tm.tm_min = 07; second_tm.tm_hour = 12; second_tm.tm_mday = 18; second_tm.tm_mon = 10; // November second_tm.tm_year = -17; // 1883 second_tm.tm_wday = 0; // Sunday second_tm.tm_yday = 321; second_tm.tm_isdst = 0; second_tm.tm_gmtoff = -28800; second_tm.tm_zone = timezone; time_t first_time = mktime(&first_tm); time_t second_time = mktime(&second_tm); printf( "first struct tm object dump: %d %d %d %d %d %d %d %d %d %ld %s\n", first_tm.tm_sec, first_tm.tm_min, first_tm.tm_hour, first_tm.tm_mday, first_tm.tm_mon, first_tm.tm_year, first_tm.tm_wday, first_tm.tm_yday, first_tm.tm_isdst, first_tm.tm_gmtoff, first_tm.tm_zone); printf( "second struct tm object dump: %d %d %d %d %d %d %d %d %d %ld %s\n", second_tm.tm_sec, second_tm.tm_min, second_tm.tm_hour, second_tm.tm_mday, second_tm.tm_mon, second_tm.tm_year, second_tm.tm_wday, second_tm.tm_yday, second_tm.tm_isdst, second_tm.tm_gmtoff, second_tm.tm_zone); printf( "First time tick: %ld Second time tick: %ld Difference: %ld secs. Should be -1 seconds instead.\n",first_time, second_time, first_time-second_time); printf( "Is this discrepancy due to the 7 min 2 sec difference between PST and Local Mean Time (Solar Time) ?\n"); return (0); } _______________________________________________ PLUG mailing list PLUG@lists.pdxlinux.org http://lists.pdxlinux.org/mailman/listinfo/plug