I also use to have a clock I downloaded out there wich is the on on th pic, that clock was a digital clock wich was pretty long, I just stuck it up the corner and show just the in game time wich was what I wanted, and it had borders and background, but I just turned them off at the window settings, maybe you can add a border or background to be able to grab it better but I would take it off when I have it where I want it, also the clock on the pic for some reason I couldn't get the AM or PM to show up so thats how it looked.
I added the clock from the pic so maybe you could edit it and take off the other times and just leave the in game one and change the color of it if that helps, Thanks.
Good Luck!