Fix timestamp and datetime processing

[zinal]

Fixes #27

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.05%. Comparing base (2590044) to head (3f35ce5).

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #29   +/-   ##
=========================================
  Coverage     51.05%   51.05%           
  Complexity      416      416           
=========================================
  Files            31       31           
  Lines          2186     2186           
  Branches        395      395           
=========================================
  Hits           1116     1116           
  Misses          899      899           
  Partials        171      171           

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