56 lines
1.9 KiB
TypeScript
56 lines
1.9 KiB
TypeScript
|
import type {
|
||
|
|
FirstWeekContainsDateOptions,
|
||
|
|
LocalizedOptions,
|
||
|
|
WeekOptions,
|
||
|
|
} from "./types.js";
|
||
|
|
/**
|
||
|
|
* The {@link setWeekYear} function options.
|
||
|
|
*/
|
||
|
|
export interface SetWeekYearOptions
|
||
|
|
extends LocalizedOptions<"options">,
|
||
|
|
WeekOptions,
|
||
|
|
FirstWeekContainsDateOptions {}
|
||
|
|
/**
|
||
|
|
* @name setWeekYear
|
||
|
|
* @category Week-Numbering Year Helpers
|
||
|
|
* @summary Set the local week-numbering year to the given date.
|
||
|
|
*
|
||
|
|
* @description
|
||
|
|
* Set the local week-numbering year to the given date,
|
||
|
|
* saving the week number and the weekday number.
|
||
|
|
* 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 date to be changed
|
||
|
|
* @param weekYear - The local week-numbering year of the new date
|
||
|
|
* @param options - An object with options
|
||
|
|
*
|
||
|
|
* @returns The new date with the local week-numbering year set
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* // Set the local week-numbering year 2004 to 2 January 2010 with default options:
|
||
|
|
* const result = setWeekYear(new Date(2010, 0, 2), 2004)
|
||
|
|
* //=> Sat Jan 03 2004 00:00:00
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* // Set the local week-numbering year 2004 to 2 January 2010,
|
||
|
|
* // if Monday is the first day of week
|
||
|
|
* // and 4 January is always in the first week of the year:
|
||
|
|
* const result = setWeekYear(new Date(2010, 0, 2), 2004, {
|
||
|
|
* weekStartsOn: 1,
|
||
|
|
* firstWeekContainsDate: 4
|
||
|
|
* })
|
||
|
|
* //=> Sat Jan 01 2005 00:00:00
|
||
|
|
*/
|
||
|
|
export declare function setWeekYear<DateType extends Date>(
|
||
|
|
date: DateType | number | string,
|
||
|
|
weekYear: number,
|
||
|
|
options?: SetWeekYearOptions,
|
||
|
|
): DateType;
|