why my static timer variable print 0 everytime i call the getcolor function?!

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 //the script for changing the background Color 
 public class sceneFading : MonoBehaviour {
     public bool fadeIn = true;
     static float minimum = 0.3f;
     static float maximum = 1f;
     static float duration=50f;
     static float startTime;
     public static Color color;
     static float timer;
     // Use this for initialization
     void Awake () {
         //  obj.color = new Color(1f, 1f, 1f, 1f);
         color = new Color(1f, 1f, 1f, minimum);
         startTime = Time.time;
     }
 
     // Update is called once per frame
     void Update() {
         timer = Time.time;
     
         /*
                 if (fadeIn)
                 {
                     float t = (Time.time - startTime) / duration;
                     color = new Color(1f, 1f, 1f, Mathf.SmoothStep(minimum, maximum, t));
                 }
                 if (!fadeIn)
                 {
                     float t = (Time.time - startTime) / duration;
                     color = new Color(1f, 1f, 1f, Mathf.SmoothStep(maximum, minimum, t));
 
                 }*/
     }
     public static Color getcolor()
     {
         
         float t = (timer - startTime) / duration;
         Debug.Log("timer" + timer +"starttime" + startTime+ "dur"+duration);
         color = new Color(1f, 1f, 1f, Mathf.SmoothStep(minimum, maximum, t));
         return color;
     }
 }