Adding endOfDay getter

[FMorschel]

Here is the new end of day getter to work with the date getter.

More context at #69

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.85%. Comparing base (97e34f5) to head (d82cf27).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #73   +/-   ##
=======================================
  Coverage   99.85%   99.85%           
=======================================
  Files           2        2           
  Lines         679      691   +12     
=======================================
+ Hits          678      690   +12     
  Misses          1        1           

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