Fog in Atmosphere is not really "fog". It's more a disease of the eyes of the player :-)

It's like a "box" transparent, glued in the player's eyes, The thickness of the walls of the box is the diference between:far and near, properties of the Fog class . The level of transparency decrease from near to far.

The reference for the Fog class is:

 
fog.active = boolean                 If  boolean is true: we have fog!    
 
fog.dropOff = n                      The fog drop-off style 
                                    (0=hard; 1=linear; 2=1/Z-squared)

fog.near = n                         How close the fog starts
 
fog.far = n                          How far you can see through the fog
 
 
fog.color = [ r, g, b]               The color Vector of the fog
 

We can use "fog" to create the ilusion of time, changing the color of the fog.

The code :

hour=5; 
fog.active=true;
fog.near=50;
fog.far=1500;
t=0;
 
 
timestep=function() {

 if(t==20){
   
  t=0;
  hour++;
  if(hour==24) hour=0;
 }

 if(hour==0)   fog.color = [.0, .0,  .3]; 
 if(hour==1)   fog.color = [.0, .0,  .3]; 
 if(hour==2)   fog.color = [.0, .0,  .3]; 
 if(hour==3)   fog.color = [.3, .35, .5]; 
 if(hour==4)   fog.color = [.4, .35, .6]; 
 if(hour==5)   fog.color = [.5, .35, .8]; 
 if(hour==6)   fog.color = [.6, .8,  .8]; 
 if(hour==7)   fog.color = [.7, .8,  .8]; 
 if(hour==8)   fog.color = [.7, .8,  .8]; 
 if(hour==9)   fog.color = [.7, .8,  .8]; 
 if(hour==10)   fog.color = [.7, .8, .8]; 
 if(hour==11)   fog.color = [.6, .8, .8]; 
 if(hour==12)   fog.color = [.5, .8, .8]; 
 if(hour==13)   fog.color = [.5, .8, .8]; 
 if(hour==14)   fog.color = [.5, .7, .8]; 
 if(hour==15)   fog.color = [.5, .7, .8]; 
 if(hour==16)   fog.color = [.5, .6, .7]; 
 if(hour==17)   fog.color = [.5, .6, .7]; 
 if(hour==18)   fog.color = [.6, .6, .7]; 
 if(hour==19)   fog.color = [.5, .5, .6]; 
 if(hour==20)   fog.color = [.5, .5, .6];
 if(hour==21)   fog.color = [.3, .35,.5]; 
 if(hour==22)   fog.color = [.0, .0, .3];
 if(hour==23)   fog.color = [.0, .0, .3];
    
 t++; 
  
} 

And the demo:

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