The other day I wanted to know when I had done something in my shell history, I asked on irc, and dre^ answered -> fc -d for zsh
Now I find myself looking at fc -l -d even when I don’t really need timestamps 
% fc -l -d
[snip]
356 14:56 vim sem.c
357 18:09 gmake
358 18:10 vim buffer.c
It is possible to get similar behavior with bash:
$ HISTTIMEFORMAT="%T " history 3
1386 09:36:54 grep -rl afio .
1387 09:37:55 vim ChangeLog
1388 12:56:57 HISTTIMEFORMAT="%T " history 3
Where HISTTIMEFORMAT uses an strftime string.
Yet another useless bit of knowledge!