Assume that the Unspecified datetime is user's local time zone.

[gdlcf88]

Close #24048

[Copilot]

Pull request overview

This PR implements timezone-aware datetime handling for unspecified DateTime values by treating them as being in the user's local timezone and converting them to UTC. This closes issue #24048.

Key Changes

• Created a new base class AbpDateTimeConverterBase<T> to consolidate common datetime conversion logic for System.Text.Json converters
• Updated datetime converters (both System.Text.Json and Newtonsoft.Json) to detect unspecified DateTimeKind values and convert them from the user's timezone to UTC
• Enhanced AbpDateTimeModelBinder to apply the same timezone conversion logic for model binding scenarios
• Added comprehensive test coverage for the new timezone-aware datetime handling

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
ModelBindingController_Tests.cs	Added three new test methods to verify timezone-aware datetime handling for simple, nullable, and complex type scenarios
ModelBindingController.cs	Added four new controller action methods that return both the DateTimeKind and the formatted datetime value for testing purposes
AbpNullableDateTimeConverter.cs	Refactored to inherit from the new AbpDateTimeConverterBase<DateTime?> class
AbpDateTimeConverterBase.cs	New abstract base class that consolidates datetime reading, writing, and timezone-aware normalization logic
AbpDateTimeConverter.cs	Refactored to inherit from the new AbpDateTimeConverterBase<DateTime> class
AbpDateTimeConverter.cs (Newtonsoft)	Added timezone conversion logic in the Normalize method to handle unspecified datetime values
AbpDateTimeModelBinderProvider.cs	Updated to inject ICurrentTimezoneProvider and ITimezoneProvider dependencies
AbpDateTimeModelBinder.cs	Added timezone conversion logic for unspecified datetime values before normalization

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[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

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