setInterval(resetAtMidnight, 450);

function resetAtMidnight() {

    var min = new Date().getMinutes();
    var sec = new Date().getSeconds();

    if(min < 1) {
        if(sec < 5) {
            users.map(user => {
                user.quests = quests.map(i => {return 0});
                user.limitdon.timerdon = users.map(i => {return 0});
            });
        }
    }

}