src/date.c


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// Februrary is altered in calp.c if year is a leap year. defaults to 28.
int
days_in_month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

int
isleap(int year) {
    return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}