LEAP_YR
for (i = 11; days < day_mon[LEAP_YR(year)][i]; i--)
time -= (day_mon[LEAP_YR(year)][i] * SEC_PER_DAY);
#define SEC_THIS_YEAR(y) (LEAP_YR(y) ? SEC_PER_LYEAR : SEC_PER_YEAR)