[jdk17u-dev] RFR: 8273369: Computing micros between two instants unexpectedly overflows for some cases

[Paul Hohensee]

On Thu, 13 Nov 2025 17:37:21 GMT, Roland Mesde <duke at openjdk.org> wrote:

> Backporting JDK-8273369: Computing micros between two instants unexpectedly overflows for some cases. Avoids overflow by not calling nanosUntil() directly, which will overflow beyond Long.MAX_VALUE difference in nano unit.
> 
> Ran GHA Sanity Checks (passed) and related test (passed).

The source of the merge conflict in Instant.java is changing to a switch expression, which we don't want to do here. Please leave it as is, and patch the original switch instead.

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Changes requested by phh (Reviewer).

PR Review: https://git.openjdk.org/jdk17u-dev/pull/4181#pullrequestreview-3478693794