External date and time check.

Hi!

I'm facing an issue that I thought I could resolve regarding date and time checking. I am currently aiming for an application in which a certain code expires after the period defined by me through the source code.

check.addEventListener(MouseEvent.CLICK, check_code);

var date_end:Date = new Date(2023, 10, 6, 10); // year, month, day, hour
var date_now:Date = new Date(); //
var differenceInMilliseconds:Number = date_end.time - date_now.time;

const MILLISECOND_PER_SECOND:int = 1000;
const SECOND_PER_MINUTES:int = 60;
const MINUTES_PER_HOUR:int = 60;
const HOURS_PER_DAY:int = 24;

var differenceInSeconds:Number = differenceInMilliseconds / MILLISECOND_PER_SECOND;
var differenceInMinutes:Number = differenceInSeconds / SECOND_PER_MINUTES;
var differenceInHouse:Number = differenceInMinutes / MINUTES_PER_HOUR;
var differenceInDays:Number = differenceInHouse / HOURS_PER_DAY;

function check_code (e:MouseEvent)
{	
	if(insert_code.text == "newCode")
	{
		if (date_now > date_end) return  error_msg.text = "Error: Invalid code";
		trace(date_now);
		trace("approved"); 
		nextFrame();
	}
	else
	{
		trace("Reject code!");
		error_msg.text = "Error: Código inválido";
	}
}

The problem is the possibility of circumventing the system, as if you change the date and time of the device used to a date earlier than the one configured, it recognizes that the code is within validity. Could you help me resolve this situation, please?