public OnPlayerConnect(playerid)
{
    //getdate & gettime
    //get date & get time from file when he got banned
    if(CurrentDay >= DayBanned && CurrentMonth >= BannedMonth && CurrentYear >= BannedYear
    && CurrentHour >= HourBanned && CurrentMinute >= BannedMinute && CurrentSecond >= BannedSecond)
    {
        //unban
    }
    else
    {
        //still banned
    }
    return 1;
}