dualfroz
491e7ada29
Instant::toISOString() and ZonedDateTime::toISOString() emitted a compact time that dropped zero seconds (e.g. 2023-11-14T22:14Z), which is valid ISO 8601 but not valid RFC 3339. Section 5.6 of RFC 3339 requires the full HH:MM:SS time even when the seconds are zero. These types are meant for interoperability, so they must always emit RFC 3339 compliant output. Build the time part of ZonedDateTime::toISOString() explicitly with a mandatory seconds component instead of delegating to LocalTime's compact formatter. Instant delegates to ZonedDateTime, so it is fixed transitively; jsonSerialize() and __toString() route through toISOString(). LocalTime's documented compact format is intentional and left unchanged. This changes the serialized string representation and is therefore a BC break; fixtures that pinned the compact output are updated accordingly.