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const daysDiff = (d1, d2) => {
var differenceInMilliseconds = d1.getTime() - d2.getTime();
let millisecondsPerDay = (1000 * 3600 * 24)
return Math.abs(differenceInMilliseconds / millisecondsPerDay)
}
var date1 = new Date("01/01/2023"); // MM/dd/yyyy
var date2 = new Date("01/31/2023"); // MM/dd/yyyy
// We wil get the days difference regardless of date parameter order.
console.log(daysDiff(date1, date2)) // 30
console.log(daysDiff(date2, date1)) // 30