Use Genesis File Timestamp (v0.37.2)

[alexanderbez]

Port of #5148 to the v0.37.x line.

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• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• Re-reviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #5149 into rc0/v0.37.2 will not change coverage.
The diff coverage is 0%.

@@             Coverage Diff              @@
##           rc0/v0.37.2    #5149   +/-   ##
============================================
  Coverage        50.96%   50.96%           
============================================
  Files              290      290           
  Lines            18850    18850           
============================================
  Hits              9607     9607           
  Misses            8550     8550           
  Partials           693      693