53 lines
1.9 KiB
TypeScript
53 lines
1.9 KiB
TypeScript
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import type { RoundingOptions } from "./types.js";
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/**
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* The {@link differenceInWeeks} function options.
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*/
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export interface DifferenceInWeeksOptions extends RoundingOptions {}
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/**
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* @name differenceInWeeks
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* @category Week Helpers
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* @summary Get the number of full weeks between the given dates.
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*
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* @description
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* Get the number of full weeks between two dates. Fractional weeks are
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* truncated towards zero by default.
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*
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* One "full week" is the distance between a local time in one day to the same
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* local time 7 days earlier or later. A full week can sometimes be less than
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* or more than 7*24 hours if a daylight savings change happens between two dates.
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*
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* To ignore DST and only measure exact 7*24-hour periods, use this instead:
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* `Math.trunc(differenceInHours(dateLeft, dateRight)/(7*24))|0`.
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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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*
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* @param dateLeft - The later date
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* @param dateRight - The earlier date
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* @param options - An object with options
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*
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* @returns The number of full weeks
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*
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* @example
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* // How many full weeks are between 5 July 2014 and 20 July 2014?
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* const result = differenceInWeeks(new Date(2014, 6, 20), new Date(2014, 6, 5))
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* //=> 2
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*
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* @example
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* // How many full weeks are between
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* // 1 March 2020 0:00 and 6 June 2020 0:00 ?
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* // Note: because local time is used, the
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* // result will always be 8 weeks (54 days),
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* // even if DST starts and the period has
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* // only 54*24-1 hours.
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* const result = differenceInWeeks(
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* new Date(2020, 5, 1),
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* new Date(2020, 2, 6)
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* )
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* //=> 8
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*/
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export declare function differenceInWeeks<DateType extends Date>(
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dateLeft: DateType | number | string,
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dateRight: DateType | number | string,
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options?: DifferenceInWeeksOptions,
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): number;
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