fix(settings): in absence form avoid shifting dates to browsers timezone

[odzhychko]

• Resolves: [Bug]: entered date is shifted back one day in Absence note #61584

Summary

Avoid shifting dates to browsers timezone in absence form.

Before (date changes after reload)

Screen.Recording.2026-06-29.at.08.40.28.mov

After (date does not change after reload)

Screen.Recording.2026-06-29.at.08.39.31.mov

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

[odzhychko]

/backport to stable34

[odzhychko]

/backport to stable33

[odzhychko]

/backport to stable32

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/server/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

[backportbot]

The backport to stable32 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable32
git pull origin stable32

# Create the new backport branch
git checkout -b backport/61638/stable32

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 0c82f741

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/61638/stable32

Error: Failed to check for changes with origin/stable32: No changes found in backport branch

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.