| 1 | import { startOfISOWeekYear } from "./startOfISOWeekYear.mjs";
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| 2 |
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| 3 | /**
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| 4 | * @name isSameISOWeekYear
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| 5 | * @category ISO Week-Numbering Year Helpers
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| 6 | * @summary Are the given dates in the same ISO week-numbering year?
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| 7 | *
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| 8 | * @description
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| 9 | * Are the given dates in the same ISO week-numbering year?
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| 10 | *
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| 11 | * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
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| 12 | *
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| 13 | * @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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| 14 | *
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| 15 | * @param dateLeft - The first date to check
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| 16 | * @param dateRight - The second date to check
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| 17 | *
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| 18 | * @returns The dates are in the same ISO week-numbering year
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| 19 | *
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| 20 | * @example
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| 21 | * // Are 29 December 2003 and 2 January 2005 in the same ISO week-numbering year?
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| 22 | * const result = isSameISOWeekYear(new Date(2003, 11, 29), new Date(2005, 0, 2))
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| 23 | * //=> true
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| 24 | */
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| 25 | export function isSameISOWeekYear(dateLeft, dateRight) {
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| 26 | const dateLeftStartOfYear = startOfISOWeekYear(dateLeft);
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| 27 | const dateRightStartOfYear = startOfISOWeekYear(dateRight);
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| 28 |
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| 29 | return +dateLeftStartOfYear === +dateRightStartOfYear;
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| 30 | }
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| 31 |
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| 32 | // Fallback for modularized imports:
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| 33 | export default isSameISOWeekYear;
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