ADDITIONAL SYSTEM INFORMATION :
Windows Java 8

A DESCRIPTION OF THE PROBLEM :
  LocalDate previousQuarterDate = LocalDate.of(2018,6,30).minus(Period.ofMonths(3));
This should give me 03/31/2018, instead we are getting 03/30/2018

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
  LocalDate previousQuarterDate = LocalDate.of(2018,6,30).minus(Period.ofMonths(3));

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
03/31/2018
ACTUAL -
03/30/2018

---------- BEGIN SOURCE ----------
import java.time.Duration;
import java.time.LocalDate;
import java.time.Month;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAdjusters;
import java.time.Period;

public class HelloWorld{

     public static void main(String []args){
         
         LocalDate previousQuarterDate = LocalDate.of(2018,6,30).minus(Period.ofMonths(3));
        System.out.println(previousQuarterDate);
     }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
import java.time.Duration;
import java.time.LocalDate;
import java.time.Month;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAdjusters;
import java.time.Period;

public class HelloWorld{

     public static void main(String []args){
         
         LocalDate previousQuarterDate = LocalDate.of(2018,6,30).minus(Period.ofMonths(3)).with(TemporalAdjusters.lastDayOfMonth());;
        System.out.println(previousQuarterDate);
     }
}