Does not work with Android 6+. please don't rate it low because of it.

This is just a theme not an actual app.
You will need Ultimate Custom Clock widget app. Its free.
Get it here.

About Skin
A clean minimal design with soft shadow that gives a 3-Dimensional feel and looks great on most wallpapers.
And now in High Resolution that looks crisp and sharp on FHD displays.

How To:

1. Install UCCW app from play store.
2. Install Minimal UCCW theme from here.
3. go to your home screen and add a 2x1 or higher uccw widget.
4. select minimal uccw theme from the list.
5. Enjoy the beautiful clock widget.

I recommend use of custom launchers like Apex launcher, Nova launcher or any other that allows custom grid size. This way you will have more flexibility in resizing and getting the desired look of the widget.