[BAEL-8456] - Moved more articles into 'java-dates' module

core-java/README.md

@@ -107,7 +107,6 @@
 - [Find Sum and Average in a Java Array](http://www.baeldung.com/java-array-sum-average)
 - [Java List UnsupportedOperationException](http://www.baeldung.com/java-list-unsupported-operation-exception)
 - [Type Erasure in Java Explained](http://www.baeldung.com/java-type-erasure)
-- [Display All Time Zones With GMT And UTC in Java](http://www.baeldung.com/java-time-zones)
 - [Join and Split Arrays and Collections in Java](http://www.baeldung.com/java-join-and-split)
 - [Check If Two Lists are Equal in Java](http://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
 - [Sending Emails with Java](http://www.baeldung.com/java-email)
@@ -132,13 +131,11 @@
 - [Guide to the this Java Keyword](http://www.baeldung.com/java-this)
 - [Jagged Arrays In Java](http://www.baeldung.com/java-jagged-arrays)
 - [Importance of Main Manifest Attribute in a Self-Executing JAR](http://www.baeldung.com/java-jar-executable-manifest-main-class)
-- [Extracting Year, Month and Day from Date in Java](http://www.baeldung.com/java-year-month-day)
 - [How to Get the File Extension of a File in Java](http://www.baeldung.com/java-file-extension)
 - [Immutable Objects in Java](http://www.baeldung.com/java-immutable-object)
 - [Console I/O in Java](http://www.baeldung.com/java-console-input-output)
 - [Guide to the java.util.Arrays Class](http://www.baeldung.com/java-util-arrays)
 - [Create a Custom Exception in Java](http://www.baeldung.com/java-new-custom-exception)
-- [Guide to java.util.GregorianCalendar](http://www.baeldung.com/java-gregorian-calendar)
 - [Java Global Exception Handler](http://www.baeldung.com/java-global-exception-handler)
 - [Encrypting and Decrypting Files in Java](http://www.baeldung.com/java-cipher-input-output-stream)
 - [How to Get the Size of an Object in Java](http://www.baeldung.com/java-size-of-object)