Yep, you have an old version. There’s been a lot of change since then. You can either still use the code you have and modify a couple lines of code, or go with a new device type that has the new look of ST (my images from above). I recommend going with the newer look. The new code will also resolve your date issue.
I found his latest code from another thread, and made the updates for you so that you can use your own image:
https://raw.githubusercontent.com/constjs/SmartThings-Devices/master/drshaw_hemv1.device.groovy
You will need to create a new device type, and then edit the device in the IDE to use your new code, just like you did for the device type you are using now.
After you do all that, go into the phone app, and when you edit the device you will now see “Set Device Image”. That will allow you to pick your own. I just tested it, and it works!
Now, if you opt to use the code you have now, replace:
this: label:'${currentValue}',
with this: label:'${currentValue}', canChangeIcon: true, canChangeBackground: true,
in the valueTile section in the Watts row for “powerDisp”. That should do the trick even though background colors are being used.
Either way, you’ll continue to build up your coding skills!
Also,I saw that your High value is crazy high. Once you reset Watts that will go away, but it will come back. There is a firmware update for HEMv1, and there’s a discussion about that here: