31 lines
805 B
TypeScript
31 lines
805 B
TypeScript
import {
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addDays,
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endOfMonth,
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isSameWeek,
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startOfMonth,
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startOfWeek,
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subDays,
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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): [Date, Date] {
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const firstDayOfMonth = startOfMonth(date);
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const startWeek = startOfWeek(firstDayOfMonth);
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const lastDayOfMonth = endOfMonth(date);
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const firstDayOfNextMonth = addDays(lastDayOfMonth, 1);
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let endWeek = startOfWeek(lastDayOfMonth);
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if (isSameWeek(lastDayOfMonth, firstDayOfNextMonth))
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endWeek = subDays(endWeek, 7);
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return [startWeek, endWeek];
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}
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export function monthNameOf(date: Date): string {
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return date.toLocaleDateString("default", { month: "long" });
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}
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