Refactor PostDate component to TS

[fabiankaegy]

Description of the Change

Alternative to #305 since I wasn't able to solve the merge conflict there

Closes #

How to test the Change

Changelog Entry

Added - New feature
Changed - Existing functionality
Deprecated - Soon-to-be removed feature
Removed - Feature
Fixed - Bug fix
Security - Vulnerability

Credits

Props @username, @username2, ...

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[github-actions]

Size Change: -111 B (0%)

Total Size: 65.5 kB

Filename	Size	Change
dist/index.js	65.5 kB	-111 B (0%)

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