Reduce visibility of TimeAndDate constants

[kingthorin]

Per: #1224 (comment)

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.16%. Comparing base (b37c566) to head (bf80c12).
⚠️ Report is 760 commits behind head on main.
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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1226      +/-   ##
============================================
- Coverage     92.35%   92.16%   -0.20%     
- Complexity     2821     3000     +179     
============================================
  Files           292      306      +14     
  Lines          5609     5906     +297     
  Branches        599      628      +29     
============================================
+ Hits           5180     5443     +263     
- Misses          275      303      +28     
- Partials        154      160       +6     

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[bodiam]

nice :-)