BAEL-1074 Difference between two dates in Java (#2493)

* Different types of bean injection in Spring

* Difference between two dates in java

* Update README.md

* Simple clean of difference between dates

* Clean my test article

core-java/pom.xml

@@ -186,6 +186,16 @@
             <artifactId>fscontext</artifactId>
             <version>${fscontext.version}</version>
         </dependency>
+        <dependency>
+            <groupId>joda-time</groupId>
+            <artifactId>joda-time</artifactId>
+            <version>${joda-time.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.darwinsys</groupId>
+            <artifactId>hirondelle-date4j</artifactId>
+            <version>${hirondelle-date4j.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -408,6 +418,8 @@
         <grep4j.version>1.8.7</grep4j.version>
         <lombok.version>1.16.12</lombok.version>
         <fscontext.version>4.6-b01</fscontext.version>
+        <joda-time.version>2.9.9</joda-time.version>
+        <hirondelle-date4j.version>1.5.1</hirondelle-date4j.version>
 
         <!-- testing -->
         <org.hamcrest.version>1.3</org.hamcrest.version>
@@ -416,9 +428,9 @@
         <assertj.version>3.6.1</assertj.version>
         <avaitility.version>1.7.0</avaitility.version>
 
+
         <!-- maven plugins -->
         <maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
         <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
-
     </properties>
 </project>