Doing content-based mtime determination

I was trying to write a plugin that basically determined the effective
mtime of an entry based on an in-entry tag like:

TIMESTAMP::2002-04-01-00-00

I like this approach over the date-in-filename approach because
mucking with the filename means mucking with the URLs of permalinks.

Unfortunately, it appears that the entry hasn't been parsed by the
time cb_filestat gets called.  Is the right approach in this case to
have a cb_filelist handler?  It seems it would be too late, and other
plugins which limit things based on date would have gotten it 'wrong'
by the time cb_filelist got called.

Any advice appreciated.

--david


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