FULL PRODUCT VERSION :
java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b132)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b70, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
There is a discrepancy between the Java 8 Nashorn implementation of setFullYear and other implementations. If the time is set on a Date object when calling setFullYear the new Date is calculated to be one day less than if the date is set to midnight (00:00:00:00) and is also one day less than the Rhino engine used in Java 7.

REGRESSION. Last worked in version 7u45

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a date with the time set e.g. new Date("January 01, 1950 00:00:01");
call setFullYear(1960) on the date
the date is now: Thu Dec 31 1959 00:00:01 GMT+0000 (GMT) rather than
Fri Jan 01 1960 00:00:01 GMT-0000 (GMT)

This was noticed in regression testing of moving some code from Java 7 to Java 8. (Rhino returns the expected result, Nashorn returns the actual).


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Before: Sun Jan 01 1950 00:00:00 GMT-0000 (GMT)
After: Fri Jan 01 1960 00:00:00 GMT-0000 (GMT)
Before: Sun Jan 01 1950 00:00:01 GMT-0000 (GMT)
After: Fri Jan 01 1960 00:00:01 GMT-0000 (GMT)

This was produced using Java 7 Rhino.

ACTUAL -
Before: Sun Jan 01 1950 00:00:00 GMT+0000 (GMT)
After: Fri Jan 01 1960 00:00:00 GMT+0000 (GMT)
Before: Sun Jan 01 1950 00:00:01 GMT+0000 (GMT)
After: Thu Dec 31 1959 00:00:01 GMT+0000 (GMT)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
print("version: " +java.lang.System.getProperty("java.version"));
var date1 = new Date("January 01, 1950 00:00:00");
print("Before: "+date1);
date1.setFullYear(1960);
print("After: "+date1);

var date2 = new Date("January 01, 1950 00:00:01");
print("Before: "+date2);
date2.setFullYear(1960);
print("After: "+date2);
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
The time element was actually unnecessary for our usage so we were able to amend the code to set the date to midnight before calling setFullYear()