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common: implement jdnHaab

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Quantum 2025-06-24 23:12:11 -04:00
parent 8988b5aa8b
commit 60d0ce3549
1 changed files with 13 additions and 0 deletions
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13
common/src/mayan.ts
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@ -69,6 +69,11 @@ export function jdnTzolkin(jdn: number): Tzolkin {
export type HaabMonth = 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19;
export type HaabDay = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19;
export type Haab = {
month: HaabMonth,
day: HaabDay,
};
const haabNames: Record<HaabMonth, string> = {
1: 'Pop',
2: 'Woʼ',
@ -94,3 +99,11 @@ const haabNames: Record<HaabMonth, string> = {
export function formatHaab(month: HaabMonth, day: HaabDay): string {
return `${day} ${haabNames[month]}`;
}
export function jdnHaab(jdn: number): Haab {
const yearDay = (jdn % 365 + 430) % 365;
return {
month: (Math.floor(yearDay / 20) + 1) as HaabMonth,
day: yearDay % 20 as HaabDay,
};
}