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Add next weekday function #104

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merged 1 commit into from
Oct 3, 2022
Merged

Add next weekday function #104

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10 changes: 10 additions & 0 deletions Date.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -123,6 +123,16 @@ describe("Date", () => {
expect(isoly.Date.getWeekDay("2022-05-07")).toEqual(6) // Saturday
expect(isoly.Date.getWeekDay("2022-05-08")).toEqual(0) // Sunday
})
it("nextWeekday", () => {
expect(isoly.Date.nextWeekday("2022-05-04")).toEqual("2022-05-05") // Wednesday -> Thursday
expect(isoly.Date.nextWeekday("2022-05-04", 2)).toEqual("2022-05-06") // Wednesday -> Friday
expect(isoly.Date.nextWeekday("2022-05-04", 3)).toEqual("2022-05-09") // Wednesday -> Monday
expect(isoly.Date.nextWeekday("2022-05-04", 4)).toEqual("2022-05-09") // Wednesday -> Monday
expect(isoly.Date.nextWeekday("2022-05-04", 5)).toEqual("2022-05-09") // Wednesday -> Monday
expect(isoly.Date.nextWeekday("2022-05-04", 6)).toEqual("2022-05-10") // Wednesday -> Tuesday
expect(isoly.Date.nextWeekday("2023-11-30", 1, ["2023-12-01"])).toEqual("2023-12-04") // Thursday -> Monday
expect(isoly.Date.nextWeekday("2023-11-30", 1, ["2023-12-01", "2023-12-04"])).toEqual("2023-12-05") // Thursday -> Tuesday
})
it("invalid date", () => {
expect(isoly.Date.is("2020-13-31")).toEqual(false)
})
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10 changes: 10 additions & 0 deletions Date.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,16 @@ export namespace Date {
export function getWeekDay(time: Date): number {
return new globalThis.Date(time).getDay()
}
export function nextWeekday(date: Date, days: number | DateSpan = 1, holidays: Date[] = []): Date {
const holidaySet = new Set(holidays)
let result = next(date, days)
let weekday = getWeekDay(result)
while (weekday == 6 || weekday == 0 || holidaySet.has(result)) {
result = next(result, weekday == 6 ? 2 : 1)
weekday = getWeekDay(result)
}
return result
}
export function span(date: Date, relative: Date): DateSpan {
return {
years: getYear(date) - getYear(relative),
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