Search for date / time when file appeared in git branches

Question

How can I get the date when the file first appeared in the branch.

I am currently using the following. The problem is that for mergers, it returns the creation date in the source branch instead of returning the merge date.

$ git log --first-parent --format=%ct FILE

Answer 1

This seems to be fixed in version 1.7.9.1 https://github.com/git/git/blob/master/Documentation/RelNotes/1.7.9.1.txt