[2KY]

pawn Code:

new
    wTicks,
    wHour, wMinute;

SetTimer("RotateTime", 1000, 1 );

stock RotateTime( )
{
    wMinute ++;
    if( wTicks == 360000 ) { wHour ++, wTicks = 0; }
    for( new i; i < MAX_PLAYERS; i ++ )
    {
        SetPlayerTime( i, wHour, wMinute );
    }
    wTicks ++;
    return true;
}

public OnPlayerDeath(playerid, killerid, reason)
{
    new hour, minute;
    GetPlayerTime( playerid, hour, minute );
    SetPlayerTime( playerid, hour-6, minute );
    return 1;
}

Also, would this result in lag..?