Total number of pages not available as proprietary tag

[o-daan]

I would like to have the total number of pages available as a tag, like pdf:totalpages or smth. Is that not in there for performance reasons (I suppose you'd have to backtrack after rendering the entire document)? I'm a php programmer with no python experience, but I would like to help if needed.

While we're at it: a tag for the current date (with a format parameter) wouldn't be such a bad idea either (I think I can even do that myself :-))