fix: formatting, simplify dates

[danielgtaylor]

Fixes a formatting bug where . was matching too many chars instead of a literal . and simplifies the human-readable representation of dates where the time component is empty.

[codecov]

Codecov Report

Merging #110 (4fd5381) into main (514b340) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
+ Coverage   64.51%   64.55%   +0.03%     
==========================================
  Files          21       21              
  Lines        2204     2206       +2     
==========================================
+ Hits         1422     1424       +2     
  Misses        629      629              
  Partials      153      153              

Impacted Files	Coverage Δ
cli/readable.go	76.40% <100.00%> (+0.54%)	⬆️

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