What is the moment().diff() method in moment.js?

// require the moment module
const moment = require("moment")
// create some dates and time
const time1 = moment([2010, 1, 14, 10, 25, 50, 125])
const time2 = moment(new Date)  // current date and time
const time3 = moment(1318781876406)
const time4 = moment({hour: 20, minute: 20, second: 34})
const time5 = moment([2022, 5, 17])
const time6 = moment([2025, 4, 18])
const time7 = moment().add(25, "seconds");
// get the difference between one time and another
console.log(time1.diff(time2))
console.log(time2.diff(time3))
console.log(time3.diff(time4))
console.log(time4.diff(time5))
console.log(time5.diff(time6))
console.log(time7.diff(time2))