[cups.general] Undocumented feature in banners?

[Alex Finch]

  So far as I know this feature is undocumented:


  When creating your own banner pages you might like to include the date of 
printing like this:

  ( {time-at-creation} ) show

            gives date in a human readable format whereas

   ( {?time-at-creation} ) show


            gives it in seconds after 1 Jan 1970, which is not very useful.

  All the other macros work identically with or without the leading ? so far as 
I can tell.

            Alex