Answers for "javascript leading zeros"

javascript print int with leading zeros

function padLeadingZeros(num, size) {
    var s = num+"";
    while (s.length < size) s = "0" + s;
    return s;
}
padLeadingZeros(57, 3);// "057"
padLeadingZeros(57, 4); //"0057"

js number add zero before

('0' + 11).slice(-2) // '11'
('0' + 4).slice(-2)  // '04'

js num to string with leading 0

String(<number>).padStart(<places>, '0')

String(42).padStart(5, '0'); 	// '00042'

Javascript add leading zeroes to date

var MyDate = new Date();
var MyDateString;

MyDate.setDate(MyDate.getDate() + 20);

MyDateString = ('0' + MyDate.getDate()).slice(-2) + '/'
             + ('0' + (MyDate.getMonth()+1)).slice(-2) + '/'
             + MyDate.getFullYear();