(js)만 나이 계산

/**
 * 만 나이 계산
 * @param {number | string} birthYear 
 * @param {number | string} birthMonth 
 * @param {number | string} birthDay 
 * @returns {number} age
*/
function getAge(birthYear, birthMonth, birthDay) {
	birthYear = Number(birthYear)
	birthMonth = Number(birthMonth)
	birthDay = Number(birthDay)
	var today = new Date()
	var curYear = today.getFullYear()
	var age = curYear - birthYear
	var curBirthDate = new Date(curYear, birthMonth - 1, birthDay)

	if(today.getTime() > curBirthDate) age--;

	return age
}