[tei-council] git help

[Syd Bauman]

How do I ask git (or GitHub) to give me a copy of a file as it
existed on 2014-04-09? Using Subversion I would:

 * get the address of the file's parent folder in the repository -- I
   likely already know this, but if not, `svn info` does the trick

 * issue something like
   $ cd /tmp/; svn co -r {2014-04-09} URL-of-parent-folder-SVN

Anything similar in git?