Implement date annotation

[tschaffter]

Implement date annotation by modifying the example code I created here

[ymnliu]

@tschaffter Do I have the permission to push on this? I tried to create a new branch but got permission denied.

[tschaffter]

You do not have write access to this repo. Did developed the code in your fork of the repository? If yes, you can go to the GitHub page of your fork to create a PR that targets the branch develop of this repo.

[github-actions]

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