Correct (short) week string result when set start of week

[xwjdsh]

Close #200

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (731fdcb) 100.00% compared to head (85ff137) 99.90%.

❗ Current head 85ff137 differs from pull request most recent head 760c884. Consider uploading reports for the commit 760c884 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #203      +/-   ##
===========================================
- Coverage   100.00%   99.90%   -0.10%     
===========================================
  Files           20       20              
  Lines         3080     3068      -12     
===========================================
- Hits          3080     3065      -15     
- Misses           0        2       +2     
- Partials         0        1       +1     

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