With you on the need for a clock .
I open messages to find 'Invite me' - reply and only realise the original msg was posted 10 hours earlier when I see the date in the corner of my own reply.
Must be easy enough for the wgt chaps to insert a piece of code showing each indiviuals own local time on messages or a stand alone version on one's own profile page.
Meantime I'll carry on converting from wgt time, to my own, and then to my correspondent's time zone (if I know it) ... grrr.