date-fns/isDate.d.cts

Modern JavaScript date utility library

/**
 * @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 declare function isDate(value: unknown): value is Date;