[Schneider]

That's fine too:

pawn Код:

new OnlinePlayers, OnlinePlayersRecord;

public OnPlayerConnect(playerid)
{
    OnlinePlayers++;
    OnlinePlayersRecord = dini_Int("OnlinePlayersRecord.txt", "OnlinePlayersRecord");
    if(OnlinePlayers > OnlinePlayersRecord)
    {
        new year, month, day, hour, minute, second;
        getdate(year, month, day);
        gettime(hour, minute, second);
        OnlinePlayersRecord = OnlinePlayers;
        dini_IntSet("OnlinePlayersRecord.txt", "OnlinePlayersRecord", OnlinePlayersRecord);
        dini_IntSet("OnlinePlayersRecord.txt", "Year", year);
        dini_IntSet("OnlinePlayersRecord.txt", "Month", month);
        dini_IntSet("OnlinePlayersRecord.txt", "Day", day);
        dini_IntSet("OnlinePlayersRecord.txt", "Hour", hour);
        dini_IntSet("OnlinePlayersRecord.txt", "Minute", minute);
        dini_IntSet("OnlinePlayersRecord.txt", "Second", second);
    }
    return 1;
}
public OnPlayerDisconnect(playerid, reason)
{
    OnlinePlayers--;
    return 1;
}

Edit: Added the date too.