Fix | DateValidator complex tag

[AlexNDRmac]

By creating this pull request, I confirm the following:

• I have read the CONTRIBUTING document.
• My change requires a change to the documentation.
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I updated the CHANGELOG.

Types 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 change)
• Link to issue (if exists):

Small description of changes:

Thanks

[codecov]

Codecov Report

Merging #155 (80188a7) into develop (4d48a81) will decrease coverage by 0.44%.
The diff coverage is 45.45%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #155      +/-   ##
===========================================
- Coverage    98.57%   98.14%   -0.44%     
===========================================
  Files           69       71       +2     
  Lines         1337     1348      +11     
===========================================
+ Hits          1318     1323       +5     
- Misses          19       25       +6