function dayOfTheWeek(day: number, month: number, year: number): string {
const dayOfTheWeekArray = ("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday")
return dayOfTheWeekArray(new Date(year, month-1, day).getDay())
};날짜 개체:
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date