Question

How to check a date is valid or not in JavaScript

Answer 1

function isValidDate(d) {
    if (Object.prototype.toString.call(d) === "[object Date]") { 
        if (isNaN(d.getTime())) {  
           return false;
        } else { 
              return true;
          } 
    } else {
    	 return false;
    }
}
 
let d1 = new Date(); 
let d2 = new Date(2020, 5, 21); 
let d3 = new Date('2020-555-19'); 
let d4 = new Date(2020, 5, 2222222221, 10, 42, 33);
let d5 = new Date(999999930000);
let d6 = new Date("May 21, 2020 16:53:00");
 
console.log(isValidDate(d1));
console.log(isValidDate(d2));
console.log(isValidDate(d3));
console.log(isValidDate(d4));
console.log(isValidDate(d5));
console.log(isValidDate(d6));
 
 
 
/*
run:
 
true
true
false
false
true
true
 
*/

 

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Answer 2

function isValidDate(d) {
    return d instanceof Date && isFinite(d)
}

let d1 = new Date(); 
let d2 = new Date(2020, 5, 21); 
let d3 = new Date('2020-555-19'); 
let d4 = new Date(2020, 5, 2222222221, 10, 42, 33);
let d5 = new Date(999999930000);
let d6 = new Date("May 21, 2020 16:53:00");

console.log(isValidDate(d1));
console.log(isValidDate(d2));
console.log(isValidDate(d3));
console.log(isValidDate(d4));
console.log(isValidDate(d5));
console.log(isValidDate(d6));


/*
run:

true
true
false
false
true
true

*/

 

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Answer 3

function isValidDate(d) {
    return d instanceof Date && !isNaN(d);
}

let d1 = new Date(); 
let d2 = new Date(2020, 5, 21); 
let d3 = new Date('2020-555-19'); 
let d4 = new Date(2020, 5, 2222222221, 10, 42, 33);
let d5 = new Date(999999930000);
let d6 = new Date("May 21, 2020 16:53:00");

console.log(isValidDate(d1));
console.log(isValidDate(d2));
console.log(isValidDate(d3));
console.log(isValidDate(d4));
console.log(isValidDate(d5));
console.log(isValidDate(d6));


/*
run:

true
true
false
false
true
true

*/

 

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