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in case you're still looking for it, I've just built one and I (slightly) modified the code to use a DS3231 RTC:
https://gist.github.com/goebish/2cfe853ec5b588c7b889b85a3a4cd441
It also displays the date with a long press of the button.

Use the sample code from the DS3231 library (link below) to set the time first.