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common: implement jdnTzolkin

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Quantum 2025-06-17 22:04:14 -04:00
parent 273e8b1d6a
commit d0d2ebcac5
1 changed files with 7 additions and 0 deletions
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7
common/src/mayan.ts
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@ -58,3 +58,10 @@ export function tzolkinName(name: TzolkinName): string {
export function formatTzolkin(tzolkin: Tzolkin): string {
return `${tzolkin.number} ${tzolkinName(tzolkin.name)}`;
}
export function jdnTzolkin(jdn: number): Tzolkin {
return {
number: ((jdn % 13 + 18) % 13 + 1) as TzolkinNumber,
name: (jdn % 20 + 36) % 20,
};
}