SVN Keywords Question

Is there any svn keyword which indicates the last date when ANY file in the
SVN repository was updated? For example, if I have three files in my SVN
repository:

readme.txt
myWebapp.jar
welcome.jpg

Is there any SVN keyword that I could put in readme.txt which would be
updated with the most recent date that any file in the repository was
updated? For example, if I updated welcome.jpg on July 2nd then I would want
the text in "readme.txt" to indicate that the package was last updated on
July 2nd even though I haven't updated my readme file.

Thanks!

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