Derek Barnstorm, a new member of BoardMod, has written his first mod contribution.  His new beta mod is called Joined Date in Message Display.  Here is a reprint of Derek's description:

Right, this is the simplest MOD in the world, but I thought I'd post it as a MOD in case anyone else would like to add it.
Carsten and ThM told me how to do this, so I've credited them as the authors, I hope that's okay. A big thanks to them both.
This is the first time I have put anything into a MOD, so if anything needs changing, please let me know.
 
Description:
This mod will add users joined date in message display.