add mir.date

[9il]

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[codecov-io]

Codecov Report

Merging #236 into master will increase coverage by 0.31%.
The diff coverage is 94.20%.

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
+ Coverage   91.33%   91.65%   +0.31%     
==========================================
  Files          51       52       +1     
  Lines        9030    10015     +985     
==========================================
+ Hits         8248     9179     +931     
- Misses        782      836      +54     

Impacted Files	Coverage Δ
source/mir/date.d	94.20% <94.20%> (ø)
source/mir/format.d	87.63% <0.00%> (+0.06%)	⬆️
source/mir/parse.d	94.78% <0.00%> (+2.60%)	⬆️

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