fix(date-picker,date-panel):fix the issue where the selected date is offset by one day in multi-time zone scenarios.

[discreted66]

删除 modelValue watcher 中错误的 val - localOffset 时区偏移，改为按输入类型（字符串取 UTC 分量、Date/Number 取本地分量）正确提取日历日期，修复西半球时区下日期选中与高亮偏移一天的问题。

PR

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

Summary by CodeRabbit

• Bug Fixes
  • Fixed date panel value handling to better preserve the selected month and year across time zones.
  • Prevented UTC-based inputs from being normalized in a way that could cause dates to shift or land on the wrong day.

[coderabbitai]

Walkthrough

The date panel’s modelValue watcher now derives date components directly from the parsed value, using UTC components for strings and local components otherwise, while removing the timezone-offset conversion and extra-day adjustment.

Changes

Date normalization

Layer / File(s)	Summary
Update model value normalization packages/renderless/src/date-panel/vue.ts	The watcher selects UTC or local date components based on the input type and passes them to modifyDate without adding an extra day.

Estimated code review effort: 2 (Simple) | ~5 minutes

Possibly related PRs

• opentiny/tiny-vue#4263: Updates the same date-panel watcher’s date normalization logic.

Suggested labels: bug

Poem

I’m a rabbit with dates in my den,
No extra day sneaks in again.
UTC or local, the parts align,
Each little calendar hop is fine.
🐇📅

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the PR’s main fix: correcting one-day date offset issues in date picker/panel multi-time-zone scenarios.

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