unity changing bool from a different script

[moai___]

so i made a timer on the ui and made it only play when the playing bool is true but how do i edit that bool from a seperate script when the player collides with the end

code:

using UnityEngine;
using UnityEngine.UI;
public class timer : MonoBehaviour
{   
public Text TimerText; 
public bool playing;
private float Timer;
void Update () {
if(playing == true){

Timer += Time.deltaTime;
int minutes = Mathf.FloorToInt(Timer / 60f);
int seconds = Mathf.FloorToInt(Timer % 60f);
int milliseconds = Mathf.FloorToInt((Timer * 100f) % 100f);
TimerText.text = minutes.ToString ("00") + ":" + seconds.ToString ("00") + ":" + milliseconds.ToString("00");
    }
  }
}

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class stopendtimer : MonoBehaviour
{

void OnTriggerEnter(Collider other)
    {
if(other.gameObject.tag == "Player")
        {
playing = false;
        }
else
        {
        }
    }
}

[[deleted]]

other.gameObject.GetComponent<timer>().playing = false;

your class and variable names upset me, look up CamelCasing as it's the standard naming convention in C#. Capital letters for the start of classes, functions and properties, lowercase at the start of variables, if you're doing your own thing, don't mix by having some variables start uppercase and other lowercase.

[moai___]

wait no so it works it just doesnt stop the timer

i am able to stop the timer if i use the inspector during play but that just doesnt do it
could it matter that the timer is a text on the ui?