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incorporate RFC 9557 time zone extension into 'date-time' format #1609

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@gregsdennis gregsdennis commented Jun 21, 2025

What kind of change does this PR introduce?

Enhancement

Issue & Discussion References

Summary

Extends the date-time format by incorporating time zone information from RFC 9557.

Does this PR introduce a breaking change?

No Yes? date-time strings that would have previously failed would now pass.

@karenetheridge
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Isn't this a breaking change, if strings that were invalid before are now considered valid?

@gregsdennis
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That's what I was thinking, too. Someone mentioned it wasn't, and I failed to research it.

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✨ Proposal: date-time format to accept those in RFC 9557
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