Fix DateTimeOffset Converter #2582

[VladislavAntonyuk]

Description of Change

Instead of using current date time offset, we need to use offset of the parameter date

Linked Issues

• Fixes [BUG] DateTimeOffsetConverter calculates wrong offset #2582

PR Checklist

• Has a linked Issue, and the Issue has been approved(bug) or Championed (feature/proposal)
• Has tests (if omitted, state reason in description)
• Has samples (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Changes adhere to coding standard
• Documentation created or updated: https://github.com/MicrosoftDocs/CommunityToolkit/pulls

Additional information

[Copilot]

Pull request overview

Fixes DateTimeOffsetConverter so ConvertBackTo computes the UTC offset based on the provided DateTime (so DST/seasonal offsets are correct), addressing #2582.

Changes:

• Updated DateTimeOffsetConverter.ConvertBackTo to use TimeZoneInfo.*.GetUtcOffset(value) instead of current-time offsets.
• Updated unit tests to validate offsets and to include offset in DateTimeOffset comparisons.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/CommunityToolkit.Maui/Converters/DateTimeOffsetConverter.shared.cs	Computes offsets from the parameter DateTime to fix DST-dependent conversions.
src/CommunityToolkit.Maui.UnitTests/Converters/DateTimeOffsetConverterTests.cs	Adjusts expected offsets and comparer to validate correct offset behavior (but includes environment-dependent cases).

[TheCodeTraveler]

Thanks Vlad!

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.