#653 - Change format of all Timestamp/Date time types to use epoch millis

src/main/java/com/avaje/ebeaninternal/server/type/ScalarTypeBaseDateTime.java

@@ -131,14 +131,20 @@ public abstract class ScalarTypeBaseDateTime<T> extends ScalarTypeBase<T> {
   }
 
   public String formatValue(T value) {
-    return convertToTimestamp(value).toString();
+    // format all timestamps into epoch millis
+    long epochMillis = convertToMillis(value);
+    return Long.toString(epochMillis);
   }
 
   public T parse(String value) {
-    return convertFromTimestamp(Timestamp.valueOf(value));
+    try {
+      long epochMillis = Long.parseLong(value);
+      return convertFromMillis(epochMillis);
+    } catch (NumberFormatException e) {
+      return convertFromTimestamp(Timestamp.valueOf(value));
+    }
   }
 
-
   public boolean isDateTimeCapable() {
     return true;
   }

src/test/java/com/avaje/ebeaninternal/server/type/ScalarTypeInstantTest.java

@@ -69,11 +69,20 @@ public class ScalarTypeInstantTest {
     Instant now = Instant.now();
     Timestamp timestamp = Timestamp.from(now);
     String formatted = type.formatValue(now);
-    assertEquals(timestamp.toString(), formatted);
+    assertEquals(""+timestamp.getTime(), formatted);
   }
 
   @Test
-  public void testParse() throws Exception {
+  public void testParse_when_epochMillis() throws Exception {
+
+    Instant now = Instant.now();
+    Timestamp timestamp = Timestamp.from(now);
+    Instant val1 = type.parse(""+timestamp.getTime());
+    assertEquals(now, val1);
+  }
+
+  @Test
+  public void testParse_when_timestampForm() throws Exception {
 
     Instant now = Instant.now();
     Timestamp timestamp = Timestamp.from(now);
@@ -81,6 +90,16 @@ public class ScalarTypeInstantTest {
     assertEquals(now, val1);
   }
 
+  @Test
+  public void testFormatAndParse() throws Exception {
+
+    Instant now = Instant.now();
+
+    String format = type.format(now);
+    Instant val1 = type.parse(format);
+    assertEquals(now, val1);
+  }
+
   @Test
   public void testIsDateTimeCapable() throws Exception {