Add Equal methods to DateTime and Date

[dominikznidar]

Adds support for for DateTime.Equal(DateTime) and Date.Equal(Date) that uses time's Equal method.

This would simplify our testing flow a lot as the dependency we use (github.com go-test/deep) skips checking time.Time's internal properties (exp, loc, ...) by default.

[codecov[bot]]

Codecov Report

Merging #76 (03523a5) into master (ccdb72d) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   81.64%   81.67%   +0.02%     
==========================================
  Files          10       10              
  Lines        1286     1288       +2     
==========================================
+ Hits         1050     1052       +2     
  Misses        164      164              
  Partials       72       72              

Impacted Files	Coverage Δ
date.go	86.15% <100.00%> (+0.21%)	:arrow_up:
time.go	95.29% <100.00%> (+0.05%)	:arrow_up:

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[fredbi]

@dominikznidar

If I understand correctly, this is just about avoiding the type conversion?

e.g.

var t1,t2 strfmt.Date

isEqual := t1.Equal(t2)

isAlsoEqual := time.Time(t1).Equal(time.Time(t2))

[dominikznidar]

@fredbi Yes. We would have to add additional checks for each DateTime or Date field in a struct.