Function isLeapYear

core/src/components/datetime/utils/helpers.ts:9–11

(year: number)

 * otherwise.
 */
export const isLeapYear = (year: number) => {
  return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0;
};

/**
 * Determines the hour cycle for a user.