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common: create shared jdnWeekDay function

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Quantum 2025-07-02 01:19:02 -04:00
parent 7c302fa44e
commit ebe627d5de
1 changed files with 6 additions and 0 deletions
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6
common/src/gregorian.ts
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@ -49,6 +49,8 @@ const monthNames: { [key in JulianMonth]: string } = {
12: 'December', 12: 'December',
}; };
export type Weekday = 0 | 1 | 2 | 3 | 4 | 5 | 6;
export const weekdayNames = [ export const weekdayNames = [
'Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday',
]; ];
@ -91,6 +93,10 @@ export function monthName(month: JulianMonth): string {
return monthNames[month]; return monthNames[month];
} }
export function jdnWeekDay(jdn: number): Weekday {
return (jdn % 7 + 8) % 7 as Weekday;
}
export function gregorianMonthDays(year: number, month: JulianMonth, julian = false): 28 | 29 | 30 | 31 { export function gregorianMonthDays(year: number, month: JulianMonth, julian = false): 28 | 29 | 30 | 31 {
switch (month) { switch (month) {
case 1: case 1: