[(.Aztec);]

This is how I did it:

On the top-

pawn Код:

new TimerOwner[MAX_PLAYERS];
forward TimeOnlineCount(playerid);

public OnPlayerDisconnect(playerid, reason)

pawn Код:

KillTimer(TimerOwner[playerid]);

public OnPlayerSpawn(playerid)

pawn Код:

//your code.
TimerOwner[playerid] = SetTimerEx("TimeOnlineCount", 60000, 1, "i", playerid); //I use minutes in this.

Anywhere-

pawn Код:

public TimeOnlineCount(playerid)
{
    File[playerid][TimeOnline]++; //Just replace this to whatever variable you use. Also, if you use an Admin System, add the variable "TimeOnline" or rename it, if you wish.
    return 1;
}