[Bug] %[a|c]d placeholder does not respect --date= option in combination with git archive

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It seems like that the place holders %ad and %cd do not respect the
- --date= option when used as part of the export substitution.

In my file I have the place holder $Format:%ad$ and in .git/config the
setting log.date = short is present.

I can very this the date setting by running
	git log --pretty=format:%ad
and I get:
2011-03-03
2011-02-28
2011-02-28
2011-02-28
2011-02-28


Now if I run on the same repo
	git archive --format=zip HEAD -o out.zip
and check the place holder in the exported zip file it is actually
replaced with:

Thu, 3 Mar 2011 10:06:43 +0100

and not

2011-03-03

The same happens with the place holder %cd

/Dietmar/


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