25 lines
648 B
TypeScript
25 lines
648 B
TypeScript
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import {
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addDays,
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endOfMonth,
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getWeek,
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isSameWeek,
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startOfMonth,
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} from "date-fns";
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/**
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* Return week bounds in a [closed, open) fashion
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* The last week is not returned if it contains the next month's start date
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* @param date
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*/
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export function weekBoundsOfMonth(date: Date): [number, number] {
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const firstDayOfMonth = startOfMonth(date);
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const startWeek = getWeek(firstDayOfMonth);
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const lastDayOfMonth = endOfMonth(date);
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const firstDayOfNextMonth = addDays(lastDayOfMonth, 1);
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let endWeek = getWeek(lastDayOfMonth);
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if (isSameWeek(lastDayOfMonth, firstDayOfNextMonth)) endWeek -= 1;
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return [startWeek, endWeek];
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}
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