In answer to this question on stackechange, I wrote gitdates.py (available from github). If it is called from a directory that is under git resivion control, it lists all the files there with the short hashtag and the date from when they were last committed. The current version is written for python version 3 and uses git.

Example output:

verbruik|2d80861|2012-10-08 19:06:33 +0200
mkindexpic|8d92934|2012-08-31 21:21:38 +0200
www-sync|bdf9956|2012-10-14 21:37:43 +0200
mkphotopage|8d92934|2012-08-31 21:21:38 +0200
softwareinfo.py|a4b6319|2012-10-28 17:00:24 +0100
mksmall|8d92934|2012-08-31 21:21:38 +0200

Note

To the extent possible under law, Roland Smith has waived all copyright and related or neighboring rights to gitdates.py. This work is published from the Netherlands.