Default date and time the the compile date/time

[mgtm98]

trafficstars

The default date and time is the compile date/time rather than 1/1/2000. the issue was by @tigoe (https://github.com/arduino-libraries/RTCZero/issues/53#issue-532749196)

[drewfish]

This is a neat idea.

To make it more efficient perhaps it could use char * instead of String. I added a String ctor and substring() call to a test sketch and it seemed to increase the elf size by 386 bytes (for the various String methods that were not stripped out).

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