git push hook to check for outdated timestamps

Could we update our git hook to refuse a push of a new commit whose
timestamp is more than, say, 24 hours in the past? Our commit history
has some timestamps in it now that are over a month off, and it's
really easy to do, because when you rebase a commit, it keeps the old
timestamp. If you then merge or cherry-pick that into an official
branch rather than patch + commit, you end up with this problem unless
you are careful to fix it by hand. It would be nice to prevent
further mistakes of this sort, as they create confusion.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company