FIX: conversion errors discovered by test

ebean-core/src/main/java/io/ebeaninternal/server/type/ScalarTypeJodaDateMidnight.java

@@ -22,7 +22,7 @@ final class ScalarTypeJodaDateMidnight extends ScalarTypeBaseDate<org.joda.time.
 
   @Override
   protected String toIsoFormat(DateMidnight value) {
-    return value.toString();
+    return value.toLocalDate().toString();
   }
 
   @Override

ebean-core/src/main/java/io/ebeaninternal/server/type/ScalarTypeJodaLocalDateTime.java

@@ -26,6 +26,11 @@ final class ScalarTypeJodaLocalDateTime extends ScalarTypeBaseDateTime<LocalDate
   protected String toJsonISO8601(LocalDateTime value) {
     return value.toString();
   }
+  
+  @Override
+  protected LocalDateTime fromJsonISO8601(String value) {
+    return LocalDateTime.parse(value);
+  }
 
   @Override
   public long convertToMillis(LocalDateTime value) {

ebean-core/src/main/java/io/ebeaninternal/server/type/ScalarTypeOffsetDateTime.java

@@ -8,8 +8,6 @@ import java.time.Instant;
 import java.time.OffsetDateTime;
 import java.time.ZoneId;
 
-import static io.ebeaninternal.server.type.IsoJsonDateTimeParser.formatIso;
-
 /**
  * ScalarType for java.sql.Timestamp.
  */
@@ -29,7 +27,7 @@ final class ScalarTypeOffsetDateTime extends ScalarTypeBaseDateTime<OffsetDateTi
 
   @Override
   protected String toJsonISO8601(OffsetDateTime value) {
-    return formatIso(value.toInstant());
+    return value.toInstant().toString();
   }
 
   @Override

ebean-core/src/main/java/io/ebeaninternal/server/type/ScalarTypeTimestamp.java

@@ -28,7 +28,7 @@ final class ScalarTypeTimestamp extends ScalarTypeBaseDateTime<Timestamp> {
 
   @Override
   protected String toJsonISO8601(Timestamp value) {
-    return formatIso(value.toInstant());
+    return value.toInstant().toString();
   }
 
   @Override