isSameISOWeekYear.js 1.2 KB

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  1. import { startOfISOWeekYear } from "./startOfISOWeekYear.js";
  2. import { normalizeDates } from "./_lib/normalizeDates.js";
  3. /**
  4. * The {@link isSameISOWeekYear} function options.
  5. */
  6. /**
  7. * @name isSameISOWeekYear
  8. * @category ISO Week-Numbering Year Helpers
  9. * @summary Are the given dates in the same ISO week-numbering year?
  10. *
  11. * @description
  12. * Are the given dates in the same ISO week-numbering year?
  13. *
  14. * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
  15. *
  16. * @param laterDate - The first date to check
  17. * @param earlierDate - The second date to check
  18. * @param options - An object with options
  19. *
  20. * @returns The dates are in the same ISO week-numbering year
  21. *
  22. * @example
  23. * // Are 29 December 2003 and 2 January 2005 in the same ISO week-numbering year?
  24. * const result = isSameISOWeekYear(new Date(2003, 11, 29), new Date(2005, 0, 2))
  25. * //=> true
  26. */
  27. export function isSameISOWeekYear(laterDate, earlierDate, options) {
  28. const [laterDate_, earlierDate_] = normalizeDates(
  29. options?.in,
  30. laterDate,
  31. earlierDate,
  32. );
  33. return +startOfISOWeekYear(laterDate_) === +startOfISOWeekYear(earlierDate_);
  34. }
  35. // Fallback for modularized imports:
  36. export default isSameISOWeekYear;