How to format Dates in lightning web components(lwc) using JavaScript

To format the javascript dates in custom formats we need to use the DateTimeFormat
The Intl.DateTimeFormat object is a constructor for objects that enable the language-sensitive date and time formatting.

Sample Code

let dt = new Date();
const dtf = new Intl.DateTimeFormat('en', {
    year: 'numeric',
    month: 'short',
    day: '2-digit'
})
const [{value: mo}, , {value: da}, , {value: ye}] = dtf.formatToParts(dt);

let formatedDate = `${da}-${mo}-${ye}`;
console.log('formatedDate ===> '+formatedDate);

Output