Well, title says it all.
I feel you, how about a Simple 12 hour Clock that works?
I also build the clock myself with picture elements or sensor. But it’s hard, because the size of the font and colors need to change according to the day/night theme and the device you use. So this situation isn’t ideal. An offical clock card would be nice, especially if you can influence the size-layout. Most of the times it needs to be big so you can see it from a distance (not always) and sometimes you need it square and sometimes you need it rectangle, so it fits for example beside a camera-card (picture entity/picture glance).