Custom date formatting supports all cases

[areq212]

Simple fix for issue #532. All cases specified in lise should work now.

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TODO

• Use cargo fmt
• Add necessary tests
• Add changelog entry

[codecov-commenter]

Codecov Report

Merging #567 (a1a5977) into master (1e37051) will decrease coverage by 0.38%.
The diff coverage is 44.11%.

@@            Coverage Diff             @@
##           master     #567      +/-   ##
==========================================
- Coverage   86.78%   86.40%   -0.39%     
==========================================
  Files          37       37              
  Lines        3815     3848      +33     
==========================================
+ Hits         3311     3325      +14     
- Misses        504      523      +19     

Impacted Files	Coverage Δ
src/app.rs	68.65% <5.00%> (-27.18%)	⬇️
tests/integration.rs	100.00% <100.00%> (ø)

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[meain]

This is great. Thanks for working on this. :)

[areq212]

Cool thanks ;)