HelenOS sources
floor_div 217 uspace/lib/c/generic/time.c time_t div = floor_div(op1, op2);
floor_div 247 uspace/lib/c/generic/time.c return (year - 70) * 365 + floor_div(year - 69, 4) -
floor_div 248 uspace/lib/c/generic/time.c floor_div(year - 1, 100) + floor_div(year + 299, 400) +
floor_div 307 uspace/lib/c/generic/time.c sec += floor_div(nsec, NSECS_PER_SEC);
floor_div 309 uspace/lib/c/generic/time.c min += floor_div(sec, SECS_PER_MIN);
floor_div 311 uspace/lib/c/generic/time.c hour += floor_div(min, MINS_PER_HOUR);
floor_div 313 uspace/lib/c/generic/time.c day += floor_div(hour, HOURS_PER_DAY);
floor_div 317 uspace/lib/c/generic/time.c year += floor_div(mon, 12);
floor_div 323 uspace/lib/c/generic/time.c year += floor_div(day, 146097) * 400;
HelenOS homepage, sources at GitHub