How to set time of System.Datetime (c#)

Questions & Answers
1

I made this day-night system that rotates the sun slowly but i want it set up that the game starts at 6am.

using UnityEngine;
using System.Collections;

public class DayNightSystem : MonoBehaviour {

	public string time;
	public float timeSpeed = 1.0f;

	private float currentTime;
	private float maxTime = 86400.0f;
	// Use this for initialization
	void Start () {
		time = System.DateTime.Now.ToString("hh:mm:ss");

		SetToRealTime ();
	
		float rot = 360 * (currentTime/maxTime)-90;
		transform.rotation = Quaternion.Euler (0, 0, rot);
	}
	
	// Update is called once per frame
	void Update () {
		float rot = (360 * (1 / maxTime))*Time.deltaTime*timeSpeed;
		transform.Rotate (0, 0, rot);

		if(currentTime > maxTime){
			currentTime -= maxTime;
		}

		currentTime += Time.deltaTime * timeSpeed;

		SetTimeString ();
	}

	void SetToRealTime(){
		currentTime = 0.0f;
		
		currentTime += System.DateTime.Now.Hour * 3600;
		currentTime += System.DateTime.Now.Minute * 60;
		currentTime += System.DateTime.Now.Second;

	}

	void SetTimeString(){
		float sec2 = currentTime;

		time = "";

		int hours = Mathf.FloorToInt (sec2 / 3600);
		sec2 -= hours * 3600;

		int minutes = Mathf.FloorToInt (sec2 / 60);
		sec2 -= minutes * 60;

		int seconds = Mathf.FloorToInt (sec2);
		sec2 -= hours;

		time += hours.ToString () + ":" + minutes.ToString() + ":" + seconds.ToString();
	}
}
2

Using DateTime here feels like overkill. If all you’re trying to implement is a 24 hour cycle, you shouldn’t need to worry about years, months, leap years, time zones, and all of the other crazy stuff that goes into representing a date.

I’m wondering if perhaps you’re better served by writing your own 24 hour clock class.

public DayCycle
{
    private float m_Seconds;
    public float seconds { get {return m_Seconds;} set {m_Seconds = Mathf.Repeat(value, 60.0f;)}}

    private int m_Minutes;
    public int minutes { get {return m_Minutes;} set {m_Minutes= Mathf.Repeat(value, 60;)}}

    private int m_Hours;
    public int hours { get {return m_Hours;} set {m_Hours= Mathf.Repeat(value, 24;)}}
}

That way you could even make it a MonoBehaviour and it could increment the values on Update.