Variable MONTH_MAP`Const`

MONTH_MAP: Readonly<
    {
        APR: 4;
        AUG: 8;
        DEC: 12;
        FEB: 2;
        JAN: 1;
        JUL: 7;
        JUN: 6;
        MAR: 3;
        MAY: 5;
        NOV: 11;
        OCT: 10;
        SEP: 9;
    },
> = ...

Mapping of 3-letter month abbreviations (JAN..DEC) to 1-indexed month numbers (1..12).