var opted_hour today new Date incomplete false var interval setInterva

var opted_hour = 0, today = new Date(), incomplete = false;
var interval = setInterval(function() {
    console.log(incomplete);
    if(today.getHours() == opted_hour && !incomplete) {
        incomplete = true;
        clearInterval(interval);
        window.open('http://vk.com');
    }
}, 1000);