Refresh every x seconds on the exact modulus second

refreshEvery.js

function refreshEvery(secs) {
    secs = typeof secs === 'undefined' && secs < 1 ? 1 : secs;
  
    var now = new Date();
    var hours = now.getHours();
    var minutes = now.getMinutes();
    var seconds = now.getSeconds();
    seconds = seconds + (secs - (seconds % secs))

    var then = new Date();
    then.setHours(hours);
    then.setMinutes(minutes);
    then.setSeconds(seconds);
    then.setMilliseconds(0);

    var timeout = (then.getTime() - now.getTime());
    setTimeout(function() { window.location.reload(true); }, timeout);
}