I tried to compile the standard TinyScreen Smartwatch sketch on the Learning website without success.  After much searching through the forum, I found Ben Roses sketch enclosed in a reply to a person having similar difficulty.   The header in Ben Rose's sketch identifies the version as:

//  TinyCircuits TinyScreen+/NRF8001 Smartwatch Example Sketch
//  Last Updated 3 March 2017

Is there a latter version somewhere? When I compile it I get the following compiler error:

F:\TinyDuino\TinyScreen_Smartwatch\TinyScreen_Smartwatch\TinyScreen_Smartwatch.ino:25:21: fatal error: RTCZero.h: No such file or directory

#include <RTCZero.h>

                     ^

compilation terminated.

exit status 1
Error compiling for board TinyScreen+.

I think the knowledge gained this time is very important because I am looking for.

RTCzero library found here: https://github.com/arduino-libraries/RTCZero