From 2779473cc2e3d1ebc66049c4a2cf3f56b44c0eb8 Mon Sep 17 00:00:00 2001
From: Umesh Awasthi <umesh@pragiti.com>
Date: Sun, 29 Apr 2018 09:28:02 -0700
Subject: [PATCH] Java Date calculation example

---
 Java/Java-date-calculation/pom.xml            | 75 +++++++++++++++++++
 .../src/main/java/com/javadevjournal/App.java | 18 +++++
 .../Java/DateDifferenceExample.java           | 25 +++++++
 .../java8/Java8DateCalculation.java           | 23 ++++++
 .../test/java/com/javadevjournal/AppTest.java | 20 +++++
 5 files changed, 161 insertions(+)
 create mode 100644 Java/Java-date-calculation/pom.xml
 create mode 100644 Java/Java-date-calculation/src/main/java/com/javadevjournal/App.java
 create mode 100644 Java/Java-date-calculation/src/main/java/com/javadevjournal/Java/DateDifferenceExample.java
 create mode 100644 Java/Java-date-calculation/src/main/java/com/javadevjournal/java8/Java8DateCalculation.java
 create mode 100644 Java/Java-date-calculation/src/test/java/com/javadevjournal/AppTest.java

diff --git a/Java/Java-date-calculation/pom.xml b/Java/Java-date-calculation/pom.xml
new file mode 100644
index 0000000..b2f2c7b
--- /dev/null
+++ b/Java/Java-date-calculation/pom.xml
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.javadevjournal</groupId>
+  <artifactId>java-date-calculation</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <name>java-date-calculation</name>
+  <!-- FIXME change it to the project's website -->
+  <url>http://www.example.com</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.compiler.source>1.7</maven.compiler.source>
+    <maven.compiler.target>1.7</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.11</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
+      <plugins>
+        <plugin>
+          <artifactId>maven-clean-plugin</artifactId>
+          <version>3.0.0</version>
+        </plugin>
+        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
+        <plugin>
+          <artifactId>maven-resources-plugin</artifactId>
+          <version>3.0.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.7.0</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>2.20.1</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>3.0.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-install-plugin</artifactId>
+          <version>2.5.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-deploy-plugin</artifactId>
+          <version>2.8.2</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>8</source>
+          <target>8</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>
diff --git a/Java/Java-date-calculation/src/main/java/com/javadevjournal/App.java b/Java/Java-date-calculation/src/main/java/com/javadevjournal/App.java
new file mode 100644
index 0000000..28f8d48
--- /dev/null
+++ b/Java/Java-date-calculation/src/main/java/com/javadevjournal/App.java
@@ -0,0 +1,18 @@
+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();
+    }
+}
diff --git a/Java/Java-date-calculation/src/main/java/com/javadevjournal/Java/DateDifferenceExample.java b/Java/Java-date-calculation/src/main/java/com/javadevjournal/Java/DateDifferenceExample.java
new file mode 100644
index 0000000..e26db14
--- /dev/null
+++ b/Java/Java-date-calculation/src/main/java/com/javadevjournal/Java/DateDifferenceExample.java
@@ -0,0 +1,25 @@
+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);
+    }
+}
diff --git a/Java/Java-date-calculation/src/main/java/com/javadevjournal/java8/Java8DateCalculation.java b/Java/Java-date-calculation/src/main/java/com/javadevjournal/java8/Java8DateCalculation.java
new file mode 100644
index 0000000..7a03561
--- /dev/null
+++ b/Java/Java-date-calculation/src/main/java/com/javadevjournal/java8/Java8DateCalculation.java
@@ -0,0 +1,23 @@
+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());
+    }
+}
diff --git a/Java/Java-date-calculation/src/test/java/com/javadevjournal/AppTest.java b/Java/Java-date-calculation/src/test/java/com/javadevjournal/AppTest.java
new file mode 100644
index 0000000..0a2788a
--- /dev/null
+++ b/Java/Java-date-calculation/src/test/java/com/javadevjournal/AppTest.java
@@ -0,0 +1,20 @@
+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 );
+    }
+}