These were originally added by Linus back in v0.99.9-230-ga8aca41, a bit was added to them since then. See https://github.com/git/git/blob/v2.9.2/date.c#L927 The v0.99.9-214-g3c07b1d commit also has some info on the warty edge cases these have to deal with. I was checking what documented "git commit --amend --date=now", but Documentation/date-formats.txt only mentions ISO/RFC formats. I thought I'd just submit a trivial patch to document this but a) maybe it's in some mysterious part of the docs I've missed b) after reading v0.99.9-214-g3c07b1d and some of the date.c code it looks like it won't be that trivial to describe this. -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html