I've finally found an app to display the time and date in the dock of Openbox. I know, it seems silly that I haven't been able to find one after all this time. However, if you know me at all, you know that I'm very fussy about my apps. If they don't behave just so, I won't use them.gtim
does exactly what I want it to do: display the time in plain text in my Openbox dock. Nothing more, nothing less. I edited the .py file a tad so that it'd show the date in a nice fasion, too.
Right clicking produces this little menu. Nifty difty.
And for the sake of showing off that I managed to match colors, here's a full screenshot of gtim in action: