epoch, rather than days since 1901.  This makes

  DateTime(float(d))==d

their normal names.

as an offset in seconds from the epoch.  This means that

  DateTime(float(d)) != d

where d is a DateTime.  This inequality often held before, or worse,
the above expression would often raise an error.

I also changed the timeTime method to always return a value
even if it might not be valid input to time.gmtime.

like:

  <!--#var aDateTime fmt="%Y-%m-%d"-->

a bug that would allow spaces in unquoted cookies.

used the constructor.

__module__ attribute for builtin functions.
Waaaaaa!

like it to be.  Oh well.  At least it's better than it was.

it handles relative paths and paths starting with '.' and '..'.

redid attribution button to use the builtin ZopeAttributionButton method.

PrincipiaTime and ZopeRedirect for PrincipiaRedirect.

dates like 1/2/3 and Oct 1, 2.

This satisfies the ZPL attribution clause.

The test for the cancel button was case sensitive.
I changed it so it would accept any case, as well as extra spaces.