Udon sharp sync float

Udon questions
1

hello >I would like to make a sync float variable for all player same if a player join later the instance I want the float stay the same for all and all time but i don’t know how to do plz help me.

using UdonSharp;
using UnityEngine;
using UnityEngine.UI;
using VRC.SDKBase;
using VRC.Udon;
using VRC.Udon.Common.Interfaces;

[UdonBehaviourSyncMode(BehaviourSyncMode.Manual)]
public class day_and_night : UdonSharpBehaviour
{
[UdonSynced] public bool times;
[UdonSynced] [Range(0f, 360f)] public float timer;
[UdonSynced] [Range(0f, 360f)] public float timers;
public Material day;
public Material night;
public AudioSource day_sound;
public AudioSource night_sound;
public Light light1;
public Light light2;
public Light light3;
public Light light4;
public Light light5;
public Light light6;
public Text day_text;
public void Start()
{
day_sound.enabled = true;
night_sound.enabled = false;
}

public void Update()
{
    day_text.text =timer.ToString();
    timer += Time.deltaTime;

    if (timer >= 360f && times == true)
    {
        timer = 0f;
        times = false;
    }
    if (timer >= 360f && times == false)
    {
        timer = 0f;
        times = true;
    }

    if (timer >= 300f && timer <= 359f && times == false)
    {
        afternoon_day();
    }
    if (timer >= 300f && timer <= 359f && times == true)
    {
        night_end();
    }

    if (timer >= 0f && timer <= 299f && times == false)
    {
        days();
    }
    if (timer >= 0f && timer <= 299f && times == true)
    {
        nights();
    }
}

public void UpdateTimer()
{
    timers = timer;
}

public void nights()
{
    RenderSettings.skybox = night;
    light1.intensity = 0.05f;
    light2.intensity = 0.05f;
    light3.intensity = 0.05f;
    light4.intensity = 0.05f;
    light5.intensity = 0.05f;
    light6.intensity = 0.05f;
    night_sound.enabled = true;
    day_sound.enabled= false;
}
public void days()
{
    RenderSettings.skybox = day;
    light1.intensity = 1f;
    light2.intensity = 1f;
    light3.intensity = 1f;
    light4.intensity = 1f;
    light5.intensity = 1f;
    light6.intensity = 1f;
    day_sound.enabled = true;
    night_sound.enabled = false;
}
public void afternoon_day()
{
    RenderSettings.skybox = day;
    light1.intensity = 0.35f;
    light2.intensity = 0.35f;
    light3.intensity = 0.35f;
    light4.intensity = 0.35f;
    light5.intensity = 0.35f;
    light6.intensity = 0.35f;
}
public void night_end()
{
    RenderSettings.skybox = night;
    light1.intensity = 0.35f;
    light2.intensity = 0.35f;
    light3.intensity = 0.35f;
    light4.intensity = 0.35f;
    light5.intensity = 0.35f;
    light6.intensity = 0.35f;
}

public override void OnPlayerJoined(VRCPlayerApi player)
{
    SendCustomNetworkEvent(NetworkEventTarget.All, "UpdateTimer");
}

}