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fix(http-specs): accept 7-digit fractional seconds datetime in ModelWithDatetime XML scenario #10016

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fix(http-specs): accept 7-digit fractional seconds datetime in ModelWithDatetime XML scenario #10016

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Copilot Mar 13, 2026
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fix(http-specs): accept 2022-08-26T18:38:00.0000000Z in ModelWithDate…
Copilot Mar 13, 2026
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chore: add changelog entry for 7-digit fractional seconds datetime wo…
Copilot Mar 15, 2026
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7 changes: 7 additions & 0 deletions .chronus/changes/add-workaround-for-test-acceptance-2026-3-15-9-20-0.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
---
changeKind: fix
packages:
- "@typespec/http-specs"
---

Accept `2022-08-26T18:38:00.0000000Z` (7 fractional digit ticks, as emitted by .NET clients) as a valid RFC3339 UTC datetime form in the `ModelWithDatetime` XML scenario.
22 changes: 20 additions & 2 deletions packages/http-specs/specs/payload/xml/mockapi.ts
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Expand Up @@ -146,6 +146,15 @@ const modelWithDatetimeNoMs = `
</ModelWithDatetime>
`;

// Some clients (e.g. .NET) serialize UTC datetimes with 7 fractional digit ticks.
// "2022-08-26T18:38:00.0000000Z" is a valid representation of the same instant; accept it too.
const modelWithDatetimeWindowsMs = `
<ModelWithDatetime>
<rfc3339>2022-08-26T18:38:00.0000000Z</rfc3339>
<rfc7231>Fri, 26 Aug 2022 14:38:00 GMT</rfc7231>
</ModelWithDatetime>
`;

function createServerTests(uri: string, data?: any) {
return {
get: passOnSuccess({
Expand Down Expand Up @@ -280,15 +289,24 @@ Scenarios.Payload_Xml_ModelWithDatetimeValue_put = passOnSuccess({
},
handler: (req: MockRequest) => {
req.expect.containsHeader("content-type", "application/xml");
// Accept both "2022-08-26T18:38:00.000Z" and "2022-08-26T18:38:00Z" as equivalent UTC datetimes.
// Accept "2022-08-26T18:38:00.000Z", "2022-08-26T18:38:00Z", and
// "2022-08-26T18:38:00.0000000Z" as equivalent UTC datetimes.
let firstError: unknown;
try {
req.expect.xmlBodyEquals(modelWithDatetime);
} catch (e) {
firstError = e;
}
if (firstError !== undefined) {
req.expect.xmlBodyEquals(modelWithDatetimeNoMs);
let secondError: unknown;
try {
req.expect.xmlBodyEquals(modelWithDatetimeNoMs);
} catch (e) {
secondError = e;
}
if (secondError !== undefined) {
req.expect.xmlBodyEquals(modelWithDatetimeWindowsMs);
}
}
return {
status: 204,
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