Timer in scoreboard?

I was wondering how to set a timer in a scoreboard. i have this set up but i dont know how to get the timer in the display of the scoreboard?

Code:java

if (commandLabel.equalsIgnoreCase("uhctimer")) {
                if (!sender.hasPermission("uhc.timer")) {
                    sender.sendMessage(ChatColor.DARK_RED
                            + "YOU DONT HAVE PERMISSION TO DO THIS!");
                    return true;
                }
 
                ScoreboardManager m = Bukkit.getScoreboardManager();
                Scoreboard timer = m.getNewScoreboard();
 
                Objective obj = timer.registerNewObjective("timer",
                        "deathCount");
                obj.setDisplaySlot(DisplaySlot.SIDEBAR);
                obj.setDisplayName(ChatColor.RED + "Time Left");
 
                for (Player online : Bukkit.getWorld("reddit").getPlayers()) {
                    online.setScoreboard(timer);
                }
                player.sendMessage(ChatColor.RED
                        + "You have started the uhc timer!");
 
            }

 

Ty Cleere
You're going to have to schedule a repeating task for the timer to count down and the scoreboard to update to display the time.

 

Gater12 Ok. How would i set that for the scoreboard to display?

 

You register a score and make an int. Every second, subtract one from this int and set it as the score.