on join:
    set {time::%player%} to now
on quit:
    clear {time::%player%}
every 1 minute:
    loop all players:
        if difference between {time::%loop-player%} and now is more than or equal to 30 minutes:
            give 1 diamond to loop-player
            send loop-player title "" with subtitle "&7Otrzymujesz Diament za gre!" for 3 seconds
            set {time::%loop-player%} to now