fgm24/Assets/Scripts/UI/SurvivalTimer.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using TMPro;

public class SurvivalTimer : MonoBehaviour
{
    [SerializeField] TextMeshProUGUI timerText;
    float elapsedTime;

    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        elapsedTime += Time.deltaTime;
        int minutes = Mathf.FloorToInt(elapsedTime / 60);
        int seconds = Mathf.FloorToInt(elapsedTime % 60);
        timerText.text = string.Format("{00:00}:{01:00}", minutes, seconds);
        GameManager.Instance.setTime(timerText.text);
    }
}