Fix keeping calendar dates if no time range change

[asimonok]

Resolves #153

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.21%. Comparing base (8504a56) to head (219d8b5).

❗ Current head 219d8b5 differs from pull request most recent head 11e5126. Consider uploading reports for the commit 11e5126 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #156   +/-   ##
=======================================
  Coverage   98.21%   98.21%           
=======================================
  Files          66       66           
  Lines         838      840    +2     
  Branches      165      154   -11     
=======================================
+ Hits          823      825    +2     
  Misses         14       14           
  Partials        1        1           

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[mikhail-vl]

Looks good!