SEC_PER_YEAR
sum = y * SEC_PER_YEAR;
sum = y * SEC_PER_YEAR;
utime->tv_sec += (year - 1970) * SEC_PER_YEAR;
utime->tv_sec = ((1970 - year) * SEC_PER_YEAR +
nyrs = sec / SEC_PER_YEAR;
if (nyrs != ((sec - (lyrs * SEC_PER_DAY)) / SEC_PER_YEAR)) {
sec -= nyrs * SEC_PER_YEAR + lyrs * SEC_PER_DAY;
sec = SEC_PER_YEAR + SEC_PER_DAY - sec;
sec = SEC_PER_YEAR - sec;