[ISSUE-192] Update how we use utc

[jama5262]

What does this PR do?

Update how we use utc

Resolves #192 and #85

[codecov]

Codecov Report

Base: 96.24% // Head: 96.30% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (20788d5) compared to base (ce20c0c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #193      +/-   ##
===========================================
+ Coverage    96.24%   96.30%   +0.06%     
===========================================
  Files           34       34              
  Lines         1516     1543      +27     
===========================================
+ Hits          1459     1486      +27     
  Misses          57       57              

Impacted Files	Coverage Δ
lib/src/display.dart	100.00% <100.00%> (ø)
lib/src/jiffy.dart	98.78% <100.00%> (+0.03%)	⬆️
lib/src/manipulator.dart	100.00% <100.00%> (ø)
lib/src/parser.dart	100.00% <100.00%> (ø)

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