Merge pull request #6656 from MherBaghinyan/BAEL-2775

Bael 2775

java-dates-2/pom.xml

@@ -15,6 +15,12 @@
     </parent>
 
     <dependencies>
+        <dependency>
+            <groupId>joda-time</groupId>
+            <artifactId>joda-time</artifactId>
+            <version>${joda-time.version}</version>
+        </dependency>
+
         <!-- test scoped -->
         <dependency>
             <groupId>org.assertj</groupId>
@@ -49,6 +55,7 @@
     <properties>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>
+        <joda-time.version>2.10</joda-time.version>
         <maven.compiler.source>1.9</maven.compiler.source>
         <maven.compiler.target>1.9</maven.compiler.target>
     </properties>

java-dates-2/src/test/java/com/baeldung/convert/ConvertDateTimeUnitTest.java

@@ -0,0 +1,59 @@
+package com.baeldung.convert;
+
+import org.joda.time.Instant;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.util.Calendar;
+import java.util.Date;
+
+public class ConvertDateTimeUnitTest {
+
+    public final long millis = 1556175797428L;
+
+    @Test
+    public void givenLocalDateTime_WhenToEpochMillis_ThenMillis() {
+        ZoneId id = ZoneId.systemDefault();
+
+        LocalDateTime localDateTime =
+                LocalDateTime.ofInstant(java.time.Instant.ofEpochMilli(millis), id);
+
+        ZonedDateTime zdt = ZonedDateTime.of(localDateTime, id);
+
+        Assert.assertEquals(millis, zdt.toInstant().toEpochMilli());
+    }
+
+    @Test
+    public void givenJava8Instant_WhenGToEpochMillis_ThenMillis() {
+        java.time.Instant instant = java.time.Instant.ofEpochMilli(millis);
+        Assert.assertEquals(millis, instant.toEpochMilli());
+    }
+
+    @Test
+    public void givenDate_WhenGetTime_ThenMillis() {
+        Date date = new Date(millis);
+        Assert.assertEquals(millis, date.getTime());
+    }
+
+    @Test
+    public void givenCalendar_WhenGetTimeInMillis_ThenMillis() {
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTime(new Date(millis));
+        Assert.assertEquals(millis, calendar.getTimeInMillis());
+    }
+
+    @Test
+    public void givenJodaInstant_WhenGetMillis_ThenMillis() {
+        Instant jodaInstant = Instant.ofEpochMilli(millis);
+        Assert.assertEquals(millis, jodaInstant.getMillis());
+    }
+
+    @Test
+    public void givenJODADateTime_WhenGetMillis_ThenMillis() {
+        org.joda.time.DateTime jodaDateTime = new org.joda.time.DateTime(millis);
+        Assert.assertEquals(millis, jodaDateTime.getMillis());
+    }
+}