Support ISO 8601 24:00 (end-of-day) in DateTime/DateTimeOffset/TimeOnly parsing#124142

Merged

stephentoub merged 23 commits intomainfrom

copilot/support-24-00-hh-mm-iso8601

Feb 15, 2026

Commits on Feb 8, 2026

Initial plan
Copilot
committed
Implement ISO 8601 24:00 support for DateTime/DateTimeOffset parsing

Copilot
and
jeffhandley
committed
Remove redundant test cases per code review feedback

Copilot
and
jeffhandley
committed
Refactor Utf8Parser hour=24 handling to eliminate code duplication

Copilot
and
tarekgh
committed
Add hour=24 support to DoStrictParse for TimeOnly.ParseExact

Copilot
and
tarekgh
committed
Clarify ISO 8601 comments with reference to specification

Copilot
and
tarekgh
committed
Add hour=24 support to ParseISO8601 method

Copilot
and
tarekgh
committed
Refactor DateTime.TryCreate to use consistent hour=24 pattern

Copilot
and
tarekgh
committed
Add hour=24 support to JSON date parsing

Copilot
and
tarekgh
committed
Fix build error: use DateTime.MaxValue.Ticks instead of DateTime.MaxTicks

Copilot
and
tarekgh
committed
Merge branch 'main' into copilot/support-24-00-hh-mm-iso8601
stephentoub
authored
Fix trailing blank line in test data file

Copilot
and
stephentoub
committed
Add hour=24 support to heuristic parser (ProcessDateTimeSuffix)

Copilot
and
tarekgh
committed
Remove duplicate hour=24 fraction validation from Utf8Parser.Date.O.cs

Copilot
and
tarekgh
committed
Merge branch 'main' into copilot/support-24-00-hh-mm-iso8601
tarekgh
authored
Apply suggestions from code review

tarekgh
and
Copilot
authored
Make TimeOnly test methods static; remove last iso8601.com URL

Copilot
and
tarekgh
committed
Fix hour=24 fraction check: use > 0 instead of != 0

Copilot
and
tarekgh
committed

Commits on Feb 9, 2026

Commits on Feb 10, 2026

Commits on Feb 13, 2026

Merge branch 'main' into copilot/support-24-00-hh-mm-iso8601
tarekgh
authored

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Support ISO 8601 24:00 (end-of-day) in DateTime/DateTimeOffset/TimeOnly parsing#124142

Support ISO 8601 24:00 (end-of-day) in DateTime/DateTimeOffset/TimeOnly parsing#124142
stephentoub merged 23 commits intomainfrom
copilot/support-24-00-hh-mm-iso8601

Commits on Feb 8, 2026

Initial plan

Implement ISO 8601 24:00 support for DateTime/DateTimeOffset parsing

Remove redundant test cases per code review feedback

Refactor Utf8Parser hour=24 handling to eliminate code duplication

Add hour=24 support to DoStrictParse for TimeOnly.ParseExact

Clarify ISO 8601 comments with reference to specification

Add hour=24 support to ParseISO8601 method

Refactor DateTime.TryCreate to use consistent hour=24 pattern

Add hour=24 support to JSON date parsing

Fix build error: use DateTime.MaxValue.Ticks instead of DateTime.MaxTicks

Merge branch 'main' into copilot/support-24-00-hh-mm-iso8601

Fix trailing blank line in test data file

Add hour=24 support to heuristic parser (ProcessDateTimeSuffix)

Remove duplicate hour=24 fraction validation from Utf8Parser.Date.O.cs

Merge branch 'main' into copilot/support-24-00-hh-mm-iso8601

Apply suggestions from code review

Make TimeOnly test methods static; remove last iso8601.com URL

Fix hour=24 fraction check: use > 0 instead of != 0

Commits on Feb 9, 2026

Move "1997-07-16T24:00" from invalid to valid JSON test data

Fix JSON hour=24 test: split Z-suffixed case into separate UTC test

Commits on Feb 10, 2026

Update src/libraries/System.Private.CoreLib/src/System/DateTime.cs

Merge branch 'main' into copilot/support-24-00-hh-mm-iso8601

Commits on Feb 13, 2026

Merge branch 'main' into copilot/support-24-00-hh-mm-iso8601