Ktor Date Header: UTC Only, Regional Time Zone Support?

Date Header Feature: Regional Time Zones Not Represented

0 reputation · 06 Feb 2025, 04:56 UTC

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Issue

The Ktor Date feature injects a Date header using RFC 1123 formatting. Internally it relies on HttpDate, which always emits a GMT string, converting any supplied ZonedDateTime to UTC before formatting.

Unresolved Decision

There is no documented option to preserve a regional time zone or customize the formatter. Developers who need to expose local time in the header face an uncertainty: should the feature be extended, or is the UTC-only implementation sufficient?

Questions

Can Ktor be extended to output a Date header in a specified regional time zone?
What impact would a non-UTC Date header have on HTTP caching and conditional requests?
Is there a way to override the default formatter to preserve local time while maintaining RFC 1123 compliance?

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Date Header Feature: Regional Time Zones Not Represented

Issue

Unresolved Decision

Questions

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