import toDate from '../toDate/index'
import requiredArgs from '../_lib/requiredArgs/index'

/**
 * @name getMonth
 * @category Month Helpers
 * @summary Get the month of the given date.
 *
 * @description
 * Get the month of the given date.
 *
 * @param {Date|Number} date - the given date
 * @returns {Number} the month
 * @throws {TypeError} 1 argument required
 *
 * @example
 * // Which month is 29 February 2012?
 * const result = getMonth(new Date(2012, 1, 29))
 * //=> 1
 */
export default function getMonth(dirtyDate: Date | number): number {
  requiredArgs(1, arguments)

  const date = toDate(dirtyDate)
  const month = date.getMonth()
  return month
}