40 lines
1 KiB
JavaScript
40 lines
1 KiB
JavaScript
import { normalizeDates } from "./_lib/normalizeDates.js";
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/**
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* The {@link differenceInCalendarYears} function options.
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*/
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/**
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* @name differenceInCalendarYears
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* @category Year Helpers
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* @summary Get the number of calendar years between the given dates.
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*
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* @description
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* Get the number of calendar years between the given dates.
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*
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* @param laterDate - The later date
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* @param earlierDate - The earlier date
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* @param options - An object with options
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* @returns The number of calendar years
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*
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* @example
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* // How many calendar years are between 31 December 2013 and 11 February 2015?
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* const result = differenceInCalendarYears(
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* new Date(2015, 1, 11),
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* new Date(2013, 11, 31)
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* );
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* //=> 2
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*/
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export function differenceInCalendarYears(laterDate, earlierDate, options) {
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const [laterDate_, earlierDate_] = normalizeDates(
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options?.in,
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laterDate,
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earlierDate,
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);
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return laterDate_.getFullYear() - earlierDate_.getFullYear();
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}
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// Fallback for modularized imports:
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export default differenceInCalendarYears;
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