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 expexted 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 expexted 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.)

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