Moment find difference between two date object

Question

I have two dates in my project which are

let a="30-03-1999"
let b="30-03-2022"

Now i need to find the difference between these two dates, so first i am converting them to moment object by

let birthdate = moment(a, 'DD-MM-YYYY')
let licenseDate = moment(b, 'DD-MM-YYYY')

//console.log(birthdate,licenseDate) gives me moment object 

Object { _isAMomentObject: true, _i: "30-03-1950", _f: "DD-MM-YYYY", _isUTC: false, _pf: {…}, _locale: {…}, _d: Date Thu Mar 30 1950 00:00:00 GMT+0530 (India Standard Time), _isValid: true }

upon running the function

var diff = licenseDate.diff(birthdate, 'years')

it returns NaN

Answer 1

DD-MM-YYYY is not the correct date format, you should try with YYYY-MM-DD, It will work fine

let a="1999-03-30"
let b="2022-03-30"
var date1 = moment(a);
var date2 = moment(b);
console.log(date1.diff(date2, 'years'))

and It will also with DD-MM-YYYY

let a="30-03-1999"
let b="30-03-2022"
var date1 = moment(a, 'DD-MM-YYYY');
var date2 = moment(b, 'DD-MM-YYYY');
console.log(date1.diff(date2, 'days'))