HelenOS sources

SECS_PER_HOUR      64 uspace/lib/c/generic/time.c #define SECS_PER_DAY   (SECS_PER_HOUR * HOURS_PER_DAY)
SECS_PER_HOUR     264 uspace/lib/c/generic/time.c 	    SECS_PER_DAY + tm->tm_hour * SECS_PER_HOUR +
HelenOS homepage, sources at GitHub