if day in date is single digit then convert it to 2 digit in datepicker code example
Example 1: How do I get Month and Date of JavaScript in 2 digit format
let MyDate = new Date();
let MyDateString;
MyDate.setDate(MyDate.getDate() + 20);
MyDateString = ('0' + MyDate.getDate()).slice(-2) + '/'
+ ('0' + (MyDate.getMonth()+1)).slice(-2) + '/'
+ MyDate.getFullYear();
Example 2: get month angular with 0
("0" + ((new Date()).getMonth() + 1)).slice(-2)