ostrov.js

let pubAPI; //je nastavene v momente ked sa logne po FB, je to nastavene zasadne pred tym ako je vyvolane changeTitle()
let dbDays; //je nastavene pred changeTitle, precita hodnotu z DB..

function changeTitle() {
    if(pubAPI) {
        let date1 = new Date();
        var date2 = new Date("2018-06-29 00:00:00");

       var timeDiff = Math.abs(date2.getTime() - date1.getTime());
       var day = Math.ceil(timeDiff / (1000 * 3600 * 24));

       console.log("Old: " + dbDays + "; New: " + day);

        if(dbDays != day) {
            let newTitle = "FEKETE FASZOK 2.A ☀ " + day + " ";
            if(day == 1) {
                newTitle += "deň";
            } else if(day == 2 || day == 3 || day == 4) {
                newTitle = "dni";
            } else {
                newTitle += "dní";
            }

            pubAPI.setTitle(newTitle, 1107781129313782, (err) => {
                if(err) {
                    console.log("[FB] Error: Cant remame group!");
                    console.log(err);

                    setTimeout(() => {
                        changeTitle();
                    }, 60000 * 60);
                } else {

                    con.query("UPDATE data SET value=? WHERE property='daysLeft';", [ day ], (err) => {
                        if(err) {
                            console.log("[DB] Update error!");
                            console.log(err);

                            setTimeout(() => {
                                changeTitle();
                            }, 60000 * 60);
                        } else {
                            dbDays = day;

                            console.log("[DB] Days left updated to " + dbDays);

                            setTimeout(() => {
                                changeTitle();
                            }, 60000 * 60);
                        }
                    });
                }
            });
        } else {
            setTimeout(() => {
                changeTitle();
            }, 60000 * 60);
        }
    } else {
        console.log("[FB] Not logged in");
        return process.exit(1);
    }
}