DateMask: Fix leap year February logic 02/29

[charles7668]

Description

Close #9855

How Has This Been Tested?

Add test case in DataMaskTests.DataMask2

Type of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (fix or improvement to the website or code docs)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.49%. Comparing base (ff672a8) to head (d41e61a).
Report is 7 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10377      +/-   ##
==========================================
+ Coverage   91.43%   91.49%   +0.06%     
==========================================
  Files         418      418              
  Lines       13226    13222       -4     
  Branches     2538     2536       -2     
==========================================
+ Hits        12093    12098       +5     
+ Misses        554      549       -5     
+ Partials      579      575       -4     

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[henon]

LOL

[henon]

Thanks @charles7668 , I see you are on a fixing spree ;)