[Lucases]

This one is better, and you won't need to script the loop inside every time command.

PHP Code:

#define SetTimeForAll(0%, %1)     for(new i; i<MAX_PLAYERS; i++) { SetPlayerTime(i, 0%, %1) } 


PHP Code:

CMD:day(playerid, params[])
{
    if(PlayerInfo[playerid][pAdmin] <= 2) return SendClientMessage(playerid, COLOR_RED, "ERROR: Insufficient Permissions!");
        SetTimeForAll(12,0);
    SendClientMessageToAll(COLOR_RED, "Server's time has been set to day time!");
    return 1;
}