date-fns/isDate.js

/**
 * @name isDate
 * @category Common Helpers
 * @summary Is the given value a date?
 *
 * @description
 * Returns true if the given value is an instance of Date. The function works for dates transferred across iframes.
 *
 * @param value - The value to check
 *
 * @returns True if the given value is a date
 *
 * @example
 * // For a valid date:
 * const result = isDate(new Date())
 * //=> true
 *
 * @example
 * // For an invalid date:
 * const result = isDate(new Date(NaN))
 * //=> true
 *
 * @example
 * // For some value:
 * const result = isDate('2014-02-31')
 * //=> false
 *
 * @example
 * // For an object:
 * const result = isDate({})
 * //=> false
 */
export function isDate(value) {
  return (
    value instanceof Date ||
    (typeof value === "object" &&
      Object.prototype.toString.call(value) === "[object Date]")
  );
}

// Fallback for modularized imports:
export default isDate;