HelenOS sources

HOURS_PER_DAY      62 uspace/lib/c/generic/time.c #define MINS_PER_DAY   (MINS_PER_HOUR * HOURS_PER_DAY)
HOURS_PER_DAY      64 uspace/lib/c/generic/time.c #define SECS_PER_DAY   (SECS_PER_HOUR * HOURS_PER_DAY)
HOURS_PER_DAY     313 uspace/lib/c/generic/time.c 	day += floor_div(hour, HOURS_PER_DAY);
HOURS_PER_DAY     314 uspace/lib/c/generic/time.c 	hour = floor_mod(hour, HOURS_PER_DAY);
HelenOS homepage, sources at GitHub