Improve date and timezone handling

[iMattPro]

Fixes #193

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.67%. Comparing base (580858f) to head (d20a263).
⚠️ Report is 20 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #194      +/-   ##
============================================
+ Coverage     98.65%   98.67%   +0.01%     
- Complexity      284      285       +1     
============================================
  Files            38       38              
  Lines           895      905      +10     
============================================
+ Hits            883      893      +10     
  Misses           12       12              

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