Set timer to a specific time.

Hello, im a begginer javascript programer and i mad a game clock. it shows 24 real life minutes whic is a day in my future game. You can pause it set the morning time and the dawn time. Now i got two booleans, setToDayTime and setToNigthTime and i want these to set the clock to the morning time and the dawn time and continue the counting from there but i havent managed to make it in the past two days. Can someone help me out? #pragma strict

 var mutato1 : GameObject;
 var mutato2 : GameObject;
 var mutato3 : GameObject;
 var mutato4 : GameObject;
 
 var dayTimeStartHour : int = 6;            //morning start
 var dayTimeEndHour : int = 18;            //morning end
 
 var setToDayTime : boolean = false;        //set clock to morning start
 var setToNigthTime : boolean = false;    //set clock to morning end
 var isItDayTime : boolean = false;
 
 var pauseGameTime : boolean = false;    //pause game time
 var displayTime : float;                //actual time displaying
 var difference: float;                     // to pause game time
 private var ido2 : float;
 
 
 function aniSprite ( spriteObject : GameObject, columnSize : float, rowSize : float, type:String, index : int) // animating spirtes 0-9
 {
     var minute1 = index % 10;
     var minute2 = (index/10) % 6;
     var minute3 = (index / 60) % 10;
     var minute4 = (index / 600) % 2.4;
     
 
     if(type == "font1")    index = minute1;
     if(type == "font2")    index = minute2;
     if(type == "font3")    index = minute3;
     if(type == "font4")    index = minute4;
 
     var size : Vector2 = Vector2 ( 1.0 / columnSize, 1.0 / rowSize );    // find scale to show on poly 
     var offset : Vector2 = Vector2(index * size.x ,1);
     
     spriteObject.renderer.material.mainTextureOffset = offset;     // apply the offset amount to the correct sprite sheet object
     spriteObject.renderer.material.mainTextureScale  = size;     // apply the scale amount to the correct sprite sheet object
 
 }
 
 function Update ()
 {
         
     var ido : float = Time.time - ido2;
         
     if(!pauseGameTime)                        //pause gametime
         {
         displayTime = ido - difference;
         ido -= difference;
         
         }
 
     if(pauseGameTime)                        //continue gametime
         {
             difference= ido - displayTime;
         }
     
 
     if( ido >= 1440)       //reset timer from 1440 seconds (24min) to 0
         {
             ido2 = Time.time - difference;
         }
 
     if(displayTime >= dayTimeStartHour * 60 && displayTime <= dayTimeEndHour * 60)
         {
          isItDayTime = true;
         }
         else
         {
             isItDayTime = false;
         }
 
 
     if(setToDayTime)
         {
             displayTime = dayTimeStartHour * 60;
             setToDayTime = false;
         }
         if(setToNigthTime)
         {
             displayTime = dayTimeEndHour * 60;
             setToNigthTime = false;
         }
 
     aniSprite (mutato1, 10, 1, "font1", displayTime);
     aniSprite (mutato2, 10, 1, "font2", displayTime);
     aniSprite (mutato3, 10, 1, "font3", displayTime);
     aniSprite (mutato4, 10, 1, "font4", displayTime);
 }