Help with Creating Day and Time Script

Before Anyone Says look at tutorials and google, I have this is my last resort, I always do my research before I post on a Forum.

In my survival game I'm trying to get my UI to have a Day and Time of Hours in 24 hour format and minutes time, but I do not want to use my systems time, I want to have a custom time where the Day starts at Day 1 and counts up by 1 after the time 24:59 hits 0:00 for midnight,and I want the Hours and time to say start at 06:30 being 6:30 in the morning instead everything starts at (Days:00) I've tried to change to say(Days: 01) and time from (Time: 00:00) to (Time: 06:30) when I do this the timer just goes nuts on what it wants to count. The Day and Time of Hours and minutes are on two separate text components, in reality I want a similar system to 7 days to die in some aspect of how the days and time scale is to be in-game time and not a real time that goes off your system and counts up by one, I do not understand code all that well and am trying to understand it if someone could help me create this system so I can set the startDay and startHours etc. Much appreciated everyone!

This is what I have so far

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.UI;

using TMPro;



public class Time_Script : MonoBehaviour

{

[SerializeField]

private TextMeshProUGUI timeText;

[SerializeField]

private TextMeshProUGUI dayText;



private float gameRunTime;

[SerializeField] private float gameTimeScale;



private string ampm;

private float minutes;

private float hours;

private int day;



private float currentHours;

private int currentDay;



void Start()

{

ampm = "AM";

}



void Update()

{

gameRunTime = Time.time;



if (Input.GetKey(KeyCode.A))

{

Time.timeScale = 2;

}

ConvertTime();



gameTimeScale = Time.timeScale;



// Testing purposes Only!!

if (Input.GetKey(KeyCode.UpArrow))

{

Time.timeScale = 50.0f;

}

ConvertTime();



}



private void ConvertTime()

{

minutes = Mathf.Floor(gameRunTime % 60);

hours = Mathf.Floor(gameRunTime / 60 % 24);

day = Mathf.FloorToInt(gameRunTime) / 1440 % 31;



Display();

}



private void Display()

{

timeText.text = hours.ToString("00") + ":" + minutes.ToString("00"); //+ " " + ampm; (Disabled AmPm)

dayText.text = day.ToString("00");

}



public void Play()

{

Time.timeScale = 10;

Debug.Log("Play Fired");

}



private void FastForward()

{

Time.timeScale = 100;

Debug.Log("FastForward Fired");

}

}