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Question by valtteri_m · Aug 09, 2014 at 02:04 PM · javascriptlightcyclenightday

Day Night Cycle Script Not Working

I have a script that when its 18:00(7:00pm)-7:00(am) the night light should go on which is dark and if its 7:00(am)-18:00(7:00pm) the day light should go on, but when I play the game both of the lights are on D: help!

 #pragma strict
 
 var Day : Light;
 var Night : Light;
 
 var dt = Date();
 
 var timetext : GUIText;
  
 function Update () {
  
 var day = dt.Now.Day.ToString();
  
 var month = dt.Now.Month.ToString();
  
 var year = dt.Now.Year.ToString();
  
 var hours = dt.Now.Hour.ToString();
         
 var minutes = dt.Now.Minute.ToString();
  
     if (parseInt(minutes) < 10) minutes = "0" + minutes;
  
 var seconds = dt.Now.Second.ToString();
  
     if(parseInt(seconds) < 10) seconds = "0" + seconds;
 
 timetext.text = day + "/" + month + "/" + year + "   " + hours + ":" + minutes + ":" + seconds;
 
     if(parseInt(hours) > 6)
         Day.enabled = true;
         Night.enabled = false;
         
     if(parseInt(hours) < 19)
         Day.enabled = true;
         Night.enabled = false;
         
     if(parseInt(hours) > 17)
         Day.enabled = false;
         Night.enabled = true;
         
     if(parseInt(hours) < 8)
         Day.enabled = false;
         Night.enabled = true;
 }
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Answer by flaviusxvii · Aug 09, 2014 at 04:21 PM

Classic mistake.. and why you should ALWAYS USE BRACES!

 if(parseInt(hours) < 8)
     Day.enabled = false;
     Night.enabled = true;

is the same as

 if(parseInt(hours) < 8) {
     Day.enabled = false;
 }
 Night.enabled = true;
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Answer by dhandley · Aug 09, 2014 at 06:14 PM

It looks like you're missing curly brackets in your 'if' statements, so the second line in each will always be executed and the Night light will always be enabled. ie:

 if(parseInt(hours) > 17) 
 {
     Day.enabled = false;
     Night.enabled = true;
 }



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Answer by Schneider21 · Aug 09, 2014 at 06:14 PM

Are you missing some curly braces on your last set of if statements? It looks like the very last Night.enabled will always be true, since only the Day.enabled = false is being tied to the if check.

Also, it seems a bit inefficient to be doing 4 if statements and all that parsing. Why not save the parsed value to a variable and do it in one if-else?

 currentHour = parseInt(hours);
 if (currentHour > 6 && currentHour < 19) {
     Day.enabled = true;
     Night.enabled = false;
 } else {
     Day.enabled = false;
     Night.enabled = true;
 }

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