Environment Information

• jruby 10.0.1.0-SNAPSHOT (3.4.2) 2025-06-27 63db5b3 OpenJDK 64-Bit Server VM 21.0.6+7-LTS on 21.0.6+7-LTS [arm64-darwin]

Expected Behavior

Time.new(2025, 6, 27, 14, 4, Rational(1, 1), 0)
# => 2025-06-27 14:04:01 +0000

Actual Behavior

Time.new(2025, 6, 27, 14, 4, Rational(1, 1), 0)
# => 2025-06-27 14:04:02 +0000

This problem was discovered when using Time.now.change(usec: 0) from activesupport Time extensions.

This is working correctly in JRuby 10.0.0.1 and was working correctly using jruby-head last week.

As I see @enebo has been making Time usec and nsec argument changes in recent days, probably that has broken this.