16 lines
635 B
TypeScript
16 lines
635 B
TypeScript
// Returns the first day (Monday) of the specified week
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// Year defaults to the current local calendar year
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export function getFirstMondayFromISOWeek(weekInYear: number, year = new Date().getFullYear()) {
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const d = new Date(year, 0, 4);
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d.setDate(d.getDate() - (d.getDay() || 7) + 1 + 7 * (weekInYear - 1));
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return d;
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}
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export function getFirstMondayFromMonthWeek(weekInMonth: number, month = new Date().getMonth() + 1, year = new Date().getFullYear()) {
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const d = new Date(year, month - 1, 4);
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const day = d.getDay() || 7;
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d.setDate(d.getDate() - day + 1);
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d.setDate(d.getDate() + 7 * (weekInMonth - 1));
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return d;
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}
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