JSFiddle - React, Tailwind, and code Playground

JavaScript

function dateToUnix(year, month, day, hour, minute, second) {
    return ((new Date(Date.UTC(year, month - 1, day, hour, minute, second))).getTime() / 1000.0);
}


document.write ( dateToUnix(2011, 7, 15, 13, 18, 52) );