set created_on parameter on export file

[alexanderBruno]

Proposed Changes

• Add created_on parameter on the exporting file.

Pull request checklist

Please check if your PR fulfills the following requirements:

• [ ] Tests
• [x] Build locally
• [ ] Code format / lint
• [ ] Docs have been reviewed and added

Pull request type

Please check the type of change your PR introduces:

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

What is the current behavior?

Issue Number: N/A

Fixes #374

What is the new behavior?

• Add created_on parameter on the exporting file.

Does this introduce a breaking change?

• [ ] Yes
• [x] No

[codecov-commenter]

Codecov Report

Merging #375 (22439d3) into master (8495979) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           master    #375      +/-   ##
=========================================
- Coverage    3.29%   3.29%   -0.01%     
=========================================
  Files          33      33              
  Lines        1182    1184       +2     
  Branches      118     119       +1     
=========================================
  Hits           39      39              
- Misses       1143    1145       +2     

Impacted Files	Coverage Δ
...y-creation/prospective-study-creation.component.ts	0.43% <0.00%> (-0.01%)	:arrow_down:

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