Fixes inconsistent conversion dates in logs - 1.7.x

[tmancey]

Uplift of #4945
Resolves brave/brave-browser#8689

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.
• You have tested your change on Nightly.
• The PR milestones match the branch they are landing to.

After you merge:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[kjozwiak]

Looks like Publish xUnit failed for both test-unit and test-browser on macOS. However, these issues are known intermittent and none blocking.

• Publish xUnit failing test-unit --> https://ci.brave.com/job/brave-browser-build-pr/job/issues%252F8689-1.7.x/2/execution/node/647/log/
• Publish xUnit failing test-browser --> https://ci.brave.com/job/brave-browser-build-pr/job/issues%252F8689-1.7.x/2/execution/node/665/log/

[kjozwiak]

Uplift into 1.7.x approved after deliberating with @brave/uplift-approvers. As per #4951 (comment), the only failure was due to Publish xUnit failing for both test-unit and test-browser on macOS. However, this is an intermittent issue that's not related to this particular PR. Please make sure that all the correct labels are being used and the associated issue is moved into the correct milestone.