The git-reflog command doesn't by default show a date alongside each entry, which strikes me as a strange oversight; I think this would be very helpful.

Are there any command-line options, or other tweaks, which can be employed to cause it to show when each reflog entry was added? The manpage isn't forthcoming...

Per the man page, you can use git log options, e.g.,

git reflog --pretty=short
git reflog –date=iso