Marc Mintel
5397309103
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62 lines
1.7 KiB
Plaintext
62 lines
1.7 KiB
Plaintext
import { normalizeDates } from "./_lib/normalizeDates.js";
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import { compareAsc } from "./compareAsc.js";
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import { differenceInCalendarMonths } from "./differenceInCalendarMonths.js";
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import { isLastDayOfMonth } from "./isLastDayOfMonth.js";
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/**
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* The {@link differenceInMonths} function options.
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*/
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/**
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* @name differenceInMonths
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* @category Month Helpers
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* @summary Get the number of full months 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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*
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* @returns The number of full months
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*
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* @example
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* // How many full months are between 31 January 2014 and 1 September 2014?
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* const result = differenceInMonths(new Date(2014, 8, 1), new Date(2014, 0, 31))
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* //=> 7
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*/
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export function differenceInMonths(laterDate, earlierDate, options) {
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const [laterDate_, workingLaterDate, earlierDate_] = normalizeDates(
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options?.in,
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laterDate,
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laterDate,
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earlierDate,
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);
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const sign = compareAsc(workingLaterDate, earlierDate_);
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const difference = Math.abs(
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differenceInCalendarMonths(workingLaterDate, earlierDate_),
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);
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if (difference < 1) return 0;
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if (workingLaterDate.getMonth() === 1 && workingLaterDate.getDate() > 27)
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workingLaterDate.setDate(30);
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workingLaterDate.setMonth(workingLaterDate.getMonth() - sign * difference);
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let isLastMonthNotFull = compareAsc(workingLaterDate, earlierDate_) === -sign;
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if (
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isLastDayOfMonth(laterDate_) &&
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difference === 1 &&
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compareAsc(laterDate_, earlierDate_) === 1
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) {
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isLastMonthNotFull = false;
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}
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const result = sign * (difference - +isLastMonthNotFull);
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return result === 0 ? 0 : result;
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}
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// Fallback for modularized imports:
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export default differenceInMonths;
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