how to find number of days between two dates in javascript code example

Example 1: javascript difference between two dates in days

const diffDays = (date, otherDate) => Math.ceil(Math.abs(date - otherDate) / (1000 * 60 * 60 * 24));

// Example
diffDays(new Date('2014-12-19'), new Date('2020-01-01'));   // 1839

Example 2: calculate days between two dates in javascript

<input id="first" value="25/2/2021"/>
<input id="second" value="26/2/2021"/>