Changes for dfDateTime serialization

[joachimmetz]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.10%. Comparing base (4ea03ef) to head (210c8fc).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5190      +/-   ##
==========================================
+ Coverage   85.05%   85.10%   +0.04%     
==========================================
  Files         456      456              
  Lines       40961    41089     +128     
==========================================
+ Hits        34839    34967     +128     
  Misses       6122     6122              

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