Add support for ZonedDateTime in EventHandler

[ArnyminerZ]

See #135 and bitfireAT/davx5-ose#1797.

[rfc2822]

See #135 (comment)

The "parse and catch exception" approach doesn't seem to be a proper solution, at least not in the handle().

I think we should define a separate parseStartDate() method that

• has well-defined inputs and outputs,
• supports the required input formats,
• is tested separately.

Within that method, we should use other methods to determine the input format. If that's really not possible, we can still use the exception method.

[ArnyminerZ]

Should be ready. I've added tests for all formats from AOSP Contacts which should cover the original issue (bitfireAT/davx5-ose#1797 - 2013-11-06T00:00:00.000Z)

[rfc2822]

Looks good, a few small things

[rfc2822]

Cool. Last minor things, then I'd say its done :)

[rfc2822]

When finished please also request a review from @sunkup

[rfc2822]

I have updated it & will merge after a copilot review so that I can release 4.5.7-rc.1.

[Copilot]

Pull request overview

This PR adds support for parsing date-time values with timezone information (ZonedDateTime/OffsetDateTime) in the EventHandler class, addressing the need to handle timestamps with time components from Android's AOSP Contacts App. Previously, only date-only formats were supported.

• Refactored date parsing logic to handle both date-time formats (with timezone) and date-only formats
• Added support for parsing partial dates with time components
• Implemented comprehensive test coverage for all supported date/time formats

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
lib/src/main/kotlin/at/bitfire/vcard4android/contactrow/EventHandler.kt	Refactored parsing logic into separate methods (parseFullDate and parsePartialDate) to handle OffsetDateTime, LocalDate, and PartialDate formats; added support for date-time formats with timezone offsets
lib/src/test/kotlin/at/bitfire/vcard4android/contactrow/EventHandlerTest.kt	Added comprehensive unit tests for the new parsing methods covering all supported date/time formats including ISO_DATE_AND_TIME_FORMAT, FULL_DATE_FORMAT, and partial date formats with and without time components

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[rfc2822]

I have adapted the last things a bit. Hope everything still works.