Environment

• jruby 9.2.0.0-SNAPSHOT (2.4.1) 2018-03-15 36b44df OpenJDK 64-Bit Server VM 25.151-b12 on 1.8.0_151-8u151-b12-0ubuntu0.17.10.2-b12 +jit [linux-x86_64]
• Linux linuxdev 4.13.0-37-generic #42-Ubuntu SMP Wed Mar 7 14:13:23 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Expected Behaviour

DateTime.jd should return a new DateTime when called with a Rational value. For example, with JRuby 9.1.16.0 and MRI 2.5.0:

$ jruby -rdate -e't=212388217200; 4.times {|n| puts DateTime.jd((t + n)/86400r) }'
2018-03-18T23:00:00+00:00
2018-03-18T23:00:01+00:00
2018-03-18T23:00:02+00:00
2018-03-18T23:00:03+00:00

The t value was calculated as:

86400 * DateTime.new(1970, 1, 1).jd + Time.utc(2018, 3, 18, 23).to_i

Actual Behaviour

DateTime.jd with the latest 9.2.0.0 snapshot build returns the wrong time when the seconds past the hour are non-zero:

$ jruby -rdate -e't=212388217200; 4.times {|n| puts DateTime.jd((t + n)/86400r) }'
2018-03-18T23:00:00+00:00
2018-03-18T23:00:24+00:00
2018-03-18T23:00:48+00:00
2018-03-18T23:01:12+00:00

It looks like something is causing the seconds past the hour to be multiplied by 24.