fix(reg): Fix DateTimeFormatter for "day" only

[Youssef1313]

GitHub Issue (If applicable): closes #19346

@ajpinedam I'll let you verify if this actually fixes it. I made this change only by looking at code

PR Type

What kind of change does this PR introduce?

What is the current behavior?

What is the new behavior?

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Please check if your PR fulfills the following requirements:

• Docs have been added/updated which fit documentation template (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
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Other information

Internal Issue (If applicable):

[ajpinedam]

@Youssef1313, thanks for this. I was looking at it, so I will validate this fix immediately

[ajpinedam]

It passes Ok. Tested this fix on Sample App:

[unodevops]

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-19347/index.html

[jeromelaban]

@Mergifyio backport release/stable/5.6

[mergify]

backport release/stable/5.6

✅ Backports have been created

• #19350 fix(reg): Fix DateTimeFormatter for "day" only (backport #19347) has been created for branch release/stable/5.6

[unodevops]

🤖 Your WebAssembly Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-19347/index.html

[jeromelaban]

Thanks @Youssef1313!