38 lines
1.3 KiB
TypeScript
38 lines
1.3 KiB
TypeScript
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import type { ContextOptions, DateArg } from "./types.js";
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/**
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* The {@link startOfISOWeek} function options.
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*/
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export interface StartOfISOWeekOptions<DateType extends Date = Date>
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extends ContextOptions<DateType> {}
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/**
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* @name startOfISOWeek
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* @category ISO Week Helpers
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* @summary Return the start of an ISO week for the given date.
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*
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* @description
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* Return the start of an ISO week for the given date.
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* The result will be in the local timezone.
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*
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* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
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*
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* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
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* @typeParam ResultDate - The result `Date` type, it is the type returned from the context function if it is passed, or inferred from the arguments.
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*
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* @param date - The original date
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* @param options - An object with options
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*
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* @returns The start of an ISO week
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*
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* @example
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* // The start of an ISO week for 2 September 2014 11:55:00:
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* const result = startOfISOWeek(new Date(2014, 8, 2, 11, 55, 0))
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* //=> Mon Sep 01 2014 00:00:00
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*/
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export declare function startOfISOWeek<
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DateType extends Date,
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ResultDate extends Date = DateType,
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>(
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date: DateArg<DateType>,
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options?: StartOfISOWeekOptions<ResultDate> | undefined,
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): ResultDate;
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