export type DateTuple = [number, number, number];

export function datetuple(d: number): DateTuple {
    return [d / 12 / 30 | 0, (d / 30 | 0) % 12, d % 30]
}

export function datefmt(d: number): string {
    return datetuple(d).map(n => n + 1).join("/");
}

export function datefrom(y: number, m: number, d: number) {
    return (y - 1) * 12 * 30 + (m - 1) * 30 + (d - 1);
}