rabidus-test/Assets/Scripts/vTimerCounter.cs

using System;
using System.Collections;
using UnityEngine;
using UnityEngine.Events;
public class vTimerCounter : MonoBehaviour, ITextChangable
{
    public bool startTimerOnStart = false;
    private bool started = false;
    public UnityEvent<object> OnTextChange => _OnTextChange;
    public UnityEvent<object> _OnTextChange = new UnityEvent<object>();

    DateTime StartTime;

    public UnityEvent OnTimeEnded; 

    public int Seconds;
    public void Start()
    {
        if (startTimerOnStart) StartTimer();
    }

    public void StartTimer()
    {
        StartTime = DateTime.Now.AddSeconds(Seconds);
        started = true;
    }

    private string lastText;



    public void AddTime(int seconds)
    {
        if (!started)
            return;

        StartTime = StartTime.AddSeconds(seconds);
    }

    private void Update()
    {
        if (!started)
            return;

        var time = DateTime.Now;

        if (time > StartTime)
        {
            started = false;
            OnTimeEnded?.Invoke();
            lastText = $"{0:D2}:{0:D2}:{0:D2}.<size=60%>{0:D3}";
            _OnTextChange?.Invoke(lastText);
            return;
        }

        var timeSpan = StartTime - time;
        
        var ms = timeSpan.Milliseconds;
        var sec = timeSpan.Seconds;
        var min = timeSpan.Minutes;
        var hour = timeSpan.Hours;
        
        lastText = $"{hour:D2}:{min:D2}:{sec:D2}.<size=60%>{ms:D3}";
        _OnTextChange?.Invoke(lastText);
    }
}