How to validate a date?

Question

I\'m trying to test to make sure a date is valid in the sense that if someone enters 2/30/2011 then it should be wrong.

How can I do this with any date?

Answer 1

My function returns true if is a valid date otherwise returns false :D

function isDate  (day, month, year){
	if(day == 0 ){
		return false;
	}
	switch(month){
		case 1: case 3: case 5: case 7: case 8: case 10: case 12:
			if(day > 31)
				return false;
			return true;
		case 2:
			if (year % 4 == 0)
				if(day > 29){
					return false;
				}
				else{
					return true;
				}
			if(day > 28){
				return false;
			}
			return true;
		case 4: case 6: case 9: case 11:
			if(day > 30){
				return false;
			}
			return true;
		default:
			return false;
	}
}

console.log(isDate(30, 5, 2017));
console.log(isDate(29, 2, 2016));
console.log(isDate(29, 2, 2015));