Fix ToChatResponse to use first appropriate CreatedAt instead of last#7193

Merged

stephentoub merged 7 commits intomainfrom

copilot/fix-created-at-value

Jan 5, 2026

Commits on Jan 5, 2026

Initial plan
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Fix ToChatResponse to use first appropriate CreatedAt value instead of last

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stephentoub
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Complete code review and security analysis

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Remove accidentally committed nuget.exe

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Address PR review feedback: update comments and use DateTimeOffset.UnixEpoch under #if NET

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Simplify IsValidCreatedAt by using direct nullable comparison

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Add tests for datetime values less than Unix epoch

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stephentoub
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