> It might be worth weaving the following information into the 
> documentation of our "datetime" function:
> 
> -------------------------
> 
> Which codes are supported depends on the platform POV-Ray is compiled 
> an/or running on.
> 
> In POV-Ray v3.7, the following codes can be expected to work reliably:
> 
> a,A,b,B,c,d,H,I,j,m,M,p,S,U,w,W,x,X,y,Y,Z,%
> 
> In POV-Ray v3.8, the following additional codes can be expected to work 
> reliably:
> 
> a,A,b,B,c,C,d,D,e,F,g,G,h,H,I,j,m,M,n,p,r,R,S,t,T,u,U,V,w,W,x,X,y,Y,z,Z,%
> 
> -------------------------
> 
> (Side note: The C99/C++11 standards define additional two-letter codes 
> starting with E or O; while those should also work in POV-Ray v3.8, 
> their result _will_ differ between systems, depending on the language 
> settings of the computer.
> 
> 
> (Also, note to self and fellow developers: It may be worth adding a 
> check in POV-Ray itself, to verify whether the formatting string 
> submitted is actually portable across platforms, and warn if it isn't.)

It may also be good to give the actual meaning of those codes when used 
with datetime.
In the current documentation, we only have


Here, %Y can be assumed to represent the year, %m the month, %d the day, 
%H the hour, %M the minutes and %S the seconds.

I have no hint about the meaning of any of the others.

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