Java Date calculation example

Java/Java-date-calculation/src/main/java/com/javadevjournal/App.java

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+package com.javadevjournal;
+
+import com.javadevjournal.Java.DateDifferenceExample;
+import com.javadevjournal.java8.Java8DateCalculation;
+
+import java.text.ParseException;
+
+/**
+ * Hello world!
+ *
+ */
+public class App 
+{
+    public static void main( String[] args ) throws ParseException {
+        Java8DateCalculation dateDifferenceExample = new Java8DateCalculation();
+        dateDifferenceExample.calculate_difference_between_dates();
+    }
+}

Java/Java-date-calculation/src/main/java/com/javadevjournal/Java/DateDifferenceExample.java

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+package com.javadevjournal.Java;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+
+public class DateDifferenceExample {
+
+    public void calculate_difference_between_dates() throws ParseException {
+        String currentDate=  "10/24/2017";
+        String finalDate=  "10/28/2017";
+
+        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MM/dd/yyyy", Locale.ENGLISH);
+        Date firstDate = simpleDateFormat.parse("06/24/2017");
+        Date secondDate = simpleDateFormat.parse("06/30/2017");
+
+        long difference = Math.abs(firstDate.getTime() - secondDate.getTime());
+        long differenceDates = difference / (24 * 60 * 60 * 1000);
+
+        //Convert long to String
+        String dayDifference = Long.toString(differenceDates);
+        System.out.println("Day Differnec is " + dayDifference);
+    }
+}

Java/Java-date-calculation/src/main/java/com/javadevjournal/java8/Java8DateCalculation.java

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+package com.javadevjournal.java8;
+
+import java.time.Duration;
+import java.time.LocalDate;
+import java.time.temporal.ChronoUnit;
+
+public class Java8DateCalculation {
+
+    public void calculate_difference_between_dates(){
+
+        //Use LocalDate and ChronoUnit
+        LocalDate firstDate = LocalDate.of(2017, 5, 6);
+        LocalDate currentDate = LocalDate.now();
+
+        long days = ChronoUnit.DAYS.between(firstDate, currentDate);
+        System.out.println(days);
+
+        //date calculation
+        LocalDate now = LocalDate.now();
+        LocalDate tenDaysAhead = now.plusDays(10);
+        System.out.println(tenDaysAhead.toString());
+    }
+}

Java/Java-date-calculation/src/test/java/com/javadevjournal/AppTest.java

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+package com.javadevjournal;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest 
+{
+    /**
+     * Rigorous Test :-)
+     */
+    @Test
+    public void shouldAnswerWithTrue()
+    {
+        assertTrue( true );
+    }
+}