Function isSameYear

packages/@internationalized/date/src/queries.ts:40–45

(a: DateValue, b: DateValue)

 * date.
 */
export function isSameYear(a: DateValue, b: DateValue): boolean {
  b = toCalendar(b, a.calendar);
  a = startOfYear(a);
  b = startOfYear(b);
  return a.era === b.era && a.year === b.year;
}

/** Returns whether the given dates occur on the same day, and are of the same calendar system. */
export function isEqualDay(a: DateValue, b: DateValue): boolean {