This is a simple java app that creates a digital clock for your use.
Just download the attached apk (zipped up) and make sure you have Java installed. Then unzip the file and double click to launch. Once the app launches just position the clock where you want it to be located. You will now have a clock that shows you the Day, Date and Time in a large easy to see font size.
Attached apk file tested on Mac OS X and Windows OS PC. Screen Caps shown below taken from Mac OS X.