How to get the specific date from a moment.js duration?

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const moment = require('moment');

// Create a moment object for the starting date
const startDate = moment('2021-10-15');

// Create a duration of 3 days
const duration = moment.duration({ days: 3 });

// Add the duration to the starting date
const endDate = startDate.clone().add(duration);

// Get the specific date from the moment object endDate
console.log(endDate.format('YYYY-MM-DD')); // Output: 2021-10-18