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differenceInDays.d.cts
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import type { ContextOptions, DateArg } from "./types.js"; /** * The {@link differenceInDays} function options. */ export interface DifferenceInDaysOptions extends ContextOptions<Date> {} /** * @name differenceInDays * @category Day Helpers * @summary Get the number of full days between the given dates. * * @description * Get the number of full day periods between two dates. Fractional days are * truncated towards zero. * * One "full day" is the distance between a local time in one day to the same * local time on the next or previous day. A full day can sometimes be less than * or more than 24 hours if a daylight savings change happens between two dates. * * To ignore DST and only measure exact 24-hour periods, use this instead: * `Math.trunc(differenceInHours(dateLeft, dateRight)/24)|0`. * * @param laterDate - The later date * @param earlierDate - The earlier date * @param options - An object with options * * @returns The number of full days according to the local timezone * * @example * // How many full days are between * // 2 July 2011 23:00:00 and 2 July 2012 00:00:00? * const result = differenceInDays( * new Date(2012, 6, 2, 0, 0), * new Date(2011, 6, 2, 23, 0) * ) * //=> 365 * * @example * // How many full days are between * // 2 July 2011 23:59:00 and 3 July 2011 00:01:00? * const result = differenceInDays( * new Date(2011, 6, 3, 0, 1), * new Date(2011, 6, 2, 23, 59) * ) * //=> 0 * * @example * // How many full days are between * // 1 March 2020 0:00 and 1 June 2020 0:00 ? * // Note: because local time is used, the * // result will always be 92 days, even in * // time zones where DST starts and the * // period has only 92*24-1 hours. * const result = differenceInDays( * new Date(2020, 5, 1), * new Date(2020, 2, 1) * ) * //=> 92 */ export declare function differenceInDays( laterDate: DateArg<Date> & {}, earlierDate: DateArg<Date> & {}, options?: DifferenceInDaysOptions | undefined, ): number;