JUnit to output millis

java-dates-2/pom.xml

@@ -8,6 +8,13 @@
     <artifactId>java-dates-2</artifactId>
     <version>1.0-SNAPSHOT</version>
 
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+
     <dependencies>
         <dependency>
             <groupId>joda-time</groupId>

java-dates-2/src/main/java/ConvertDateTime.java

@@ -1,50 +0,0 @@
-import org.joda.time.Instant;
-
-import java.time.LocalDateTime;
-import java.time.ZoneId;
-import java.time.ZonedDateTime;
-import java.util.Calendar;
-import java.util.Date;
-
-public class ConvertDateTime {
-
-    public static void main(String[] args) {
-
-        java8();
-        joda();
-        Date date = coreDate();
-        calendar(date);
-    }
-
-    private static Date coreDate() {
-        Date date = new Date();
-
-        System.out.println("Date - Time in milliseconds : " + date.getTime());
-
-        return date;
-    }
-
-    private static void calendar(Date date) {
-        Calendar calendar = Calendar.getInstance();
-        calendar.setTime(date);
-        System.out.println("Calender - Time in milliseconds : " + calendar.getTimeInMillis());
-    }
-
-    private static void joda() {
-        org.joda.time.DateTime jodaDateTime = new org.joda.time.DateTime();
-        long delta = jodaDateTime.getMillis();
-        System.out.println("Joda - Time in milliseconds : " + delta);
-
-        Instant jodaInstant = Instant.now();
-        System.out.println("Joda - Instant in milliseconds : " + jodaInstant.getMillis());
-    }
-
-    private static void java8() {
-        long instantMillis = java.time.Instant.now().toEpochMilli();
-
-        LocalDateTime localDateTime = LocalDateTime.now();
-        ZoneId id = ZoneId.systemDefault();
-        ZonedDateTime zdt = ZonedDateTime.of(localDateTime, id);
-        System.out.println("Java 8 - Time in milliseconds : " + zdt.toInstant().toEpochMilli());
-    }
-}

java-dates-2/src/main/java/com/baeldung/convert/ConvertDateTime.java

@@ -0,0 +1,45 @@
+package com.baeldung.convert;
+
+import org.joda.time.Instant;
+
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.util.Calendar;
+import java.util.Date;
+
+public class ConvertDateTime {
+
+    public static long coreDate() {
+        Date date = new Date();
+        return date.getTime();
+    }
+
+    public static long calendar() {
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTime(new Date());
+        return calendar.getTimeInMillis();
+    }
+
+    public static long jodaInstant() {
+        Instant jodaInstant = Instant.now();
+        return jodaInstant.getMillis();
+    }
+
+    public static long jodaDateTime() {
+        org.joda.time.DateTime jodaDateTime = new org.joda.time.DateTime();
+        return jodaDateTime.getMillis();
+    }
+
+    public static long java8Instant() {
+        return java.time.Instant.now().toEpochMilli();
+    }
+
+    public static long java8LocalDateTime() {
+
+        LocalDateTime localDateTime = LocalDateTime.now();
+        ZoneId id = ZoneId.systemDefault();
+        ZonedDateTime zdt = ZonedDateTime.of(localDateTime, id);
+        return zdt.toInstant().toEpochMilli();
+    }
+}

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

@@ -0,0 +1,13 @@
+package com.baeldung.convert;
+
+import org.junit.Test;
+
+public class ConvertDateTimeUnitTest {
+
+    @Test
+    public void givenLocalDateTime_WhenGetMillis() {
+        long millis = ConvertDateTime.java8LocalDateTime();
+        System.out.println("LocalDateTime in milliseconds : " + millis);
+    }
+
+}