[Joe Staff]

Why are you using a timer? Just save how many milliseconds that player has been on the server.

pawn Код:

public OnPlayerConnect(playerid)
{
    PlayerData[playerid][Time] = GetTickCount();
}
public OnPlayerDisconnect(playerid,reason)
{
    dini_IntSet(file, "Time", dini_Int(file, "Time")+(GetTickCount()-PlayerData[playerid][Time]));
}

Then dini_Int(file, "Time") will return how many milliseconds the player has been on the server (use a time converter to change it to hours/minutes)