FULL PRODUCT VERSION : A DESCRIPTION OF THE PROBLEM : Adding more than 255 units of QUARTER_YEARS to a temporal instance is faulty. E.g. adding 256 QUARTER_YEARS is adding 1 year instead of 64 years. See http://hg.openjdk.java.net/jdk9/jdk9/jdk/file/65464a307408/src/java.base/share/classes/java/time/temporal/IsoFields.java#l709 STEPS TO FOLLOW TO REPRODUCE THE PROBLEM : LocalDate d = LocalDate.of(1900, 1, 1); System.out.println(d.plus(255, IsoFields.QUARTER_YEARS)); System.out.println(d.plus(256, IsoFields.QUARTER_YEARS)); EXPECTED VERSUS ACTUAL BEHAVIOR : EXPECTED - 1963-10-01 1964-01-01 ACTUAL - 1963-10-01 1901-01-01 REPRODUCIBILITY : This bug can be reproduced always.