53 lines
1.8 KiB
TypeScript
53 lines
1.8 KiB
TypeScript
|
import type {
|
||
|
|
FirstWeekContainsDateOptions,
|
||
|
|
LocalizedOptions,
|
||
|
|
WeekOptions,
|
||
|
|
} from "./types.js";
|
||
|
|
/**
|
||
|
|
* The {@link getWeekYear} function options.
|
||
|
|
*/
|
||
|
|
export interface GetWeekYearOptions
|
||
|
|
extends LocalizedOptions<"options">,
|
||
|
|
WeekOptions,
|
||
|
|
FirstWeekContainsDateOptions {}
|
||
|
|
/**
|
||
|
|
* @name getWeekYear
|
||
|
|
* @category Week-Numbering Year Helpers
|
||
|
|
* @summary Get the local week-numbering year of the given date.
|
||
|
|
*
|
||
|
|
* @description
|
||
|
|
* Get the local week-numbering year of the given date.
|
||
|
|
* The exact calculation depends on the values of
|
||
|
|
* `options.weekStartsOn` (which is the index of the first day of the week)
|
||
|
|
* and `options.firstWeekContainsDate` (which is the day of January, which is always in
|
||
|
|
* the first week of the week-numbering year)
|
||
|
|
*
|
||
|
|
* Week numbering: https://en.wikipedia.org/wiki/Week#The_ISO_week_date_system
|
||
|
|
*
|
||
|
|
* @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).
|
||
|
|
*
|
||
|
|
* @param date - The given date
|
||
|
|
* @param options - An object with options.
|
||
|
|
*
|
||
|
|
* @returns The local week-numbering year
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* // Which week numbering year is 26 December 2004 with the default settings?
|
||
|
|
* const result = getWeekYear(new Date(2004, 11, 26))
|
||
|
|
* //=> 2005
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* // Which week numbering year is 26 December 2004 if week starts on Saturday?
|
||
|
|
* const result = getWeekYear(new Date(2004, 11, 26), { weekStartsOn: 6 })
|
||
|
|
* //=> 2004
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* // Which week numbering year is 26 December 2004 if the first week contains 4 January?
|
||
|
|
* const result = getWeekYear(new Date(2004, 11, 26), { firstWeekContainsDate: 4 })
|
||
|
|
* //=> 2004
|
||
|
|
*/
|
||
|
|
export declare function getWeekYear<DateType extends Date>(
|
||
|
|
date: DateType | number | string,
|
||
|
|
options?: GetWeekYearOptions,
|
||
|
|
): number;
|