handle ISO format dates.

[scottleedavis]

Issue #149

[codecov]

Codecov Report

Merging #151 into master will increase coverage by 0.12%.
The diff coverage is 65.21%.

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
+ Coverage   53.53%   53.65%   +0.12%     
==========================================
  Files          12       12              
  Lines        3024     3047      +23     
==========================================
+ Hits         1619     1635      +16     
- Misses       1200     1204       +4     
- Partials      205      208       +3

Impacted Files	Coverage Δ
server/occurrence.go	58.36% <100%> (-0.14%)	⬇️
server/parse.go	66.85% <50%> (+0.33%)	⬆️

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