Ignore timezone when tracking

[timothy-nunn]

Fixes the tracker to ignore timezone information in the date field. The tracker already assumes UTC, as does PROCESS now, hence we lose no information by disregarding 'UTC' from the date string. This method is backwards compatible with data that does not include timezone.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.83%. Comparing base (b9ac104) to head (771f43d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3516   +/-   ##
=======================================
  Coverage   30.83%   30.83%           
=======================================
  Files          80       80           
  Lines       19322    19322           
=======================================
  Hits         5958     5958           
  Misses      13364    13364           

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