Yup - nothing I can do about mailmap without commit access. On the dates - I was just spitting out what git gave me... I've delved into git help log => PRETTY FORMATS and changed it to use a unix timestamp and reverted to the old (python default) format. Updated script in https://bugs.gentoo.org/show_bug.cgi?id=559894
Output now looks like: Removals: dev-java/antenna 2015-09-03 14:45:07 monsieurp b4215f4 dev-java/jjtraveler 2015-09-03 14:46:28 monsieurp 0bda332 net-misc/netcf 2015-09-06 20:49:42 cardoe b32b14c