odata2-lib/odata-client-core/src/main/java/org/apache/olingo/odata2/client/core/ep/serializer/AtomEntryEntitySerializer.java [402:440]:
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        if (title != null) {
          writer.writeCharacters(title);
        }
      } else {
        writer.writeCharacters(eia.getEntitySetName());
      }
      writer.writeEndElement();

      writer.writeStartElement(FormatXml.ATOM_UPDATED);

      writer.writeCharacters(getUpdatedString(eia, data));

      writer.writeEndElement();
    } catch (XMLStreamException e) {
      throw new EntityProviderProducerException(EntityProviderException.COMMON, e);
    } catch (EdmSimpleTypeException e) {
      throw new EntityProviderProducerException(e.getMessageReference(), e);
    }
  }

  String getUpdatedString(final EntityInfoAggregator eia, final Map<String, Object> data)
      throws EdmSimpleTypeException, EntityProviderProducerException {
    Object updateDate = null;
    EdmFacets updateFacets = null;
    EntityPropertyInfo updatedInfo = eia.getTargetPathInfo(EdmTargetPath.SYNDICATION_UPDATED);
    if (updatedInfo != null) {
      updateDate = data.get(updatedInfo.getName());
      if (updateDate != null) {
        updateFacets = updatedInfo.getFacets();
      }
    }
    if (updateDate == null) {
      updateDate = new Date();
    }
    try {
      return EdmDateTimeOffset.getInstance().valueToString(updateDate, EdmLiteralKind.DEFAULT, updateFacets);
    } catch (final EdmSimpleTypeException e) {
      throw new EntityProviderProducerException(
          EdmSimpleTypeException.getMessageReference(e.getMessageReference()).
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odata2-lib/odata-core/src/main/java/org/apache/olingo/odata2/core/ep/producer/AtomEntryEntityProducer.java [465:503]:
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        if (title != null) {
          writer.writeCharacters(title);
        }
      } else {
        writer.writeCharacters(eia.getEntitySetName());
      }
      writer.writeEndElement();

      writer.writeStartElement(FormatXml.ATOM_UPDATED);

      writer.writeCharacters(getUpdatedString(eia, data));

      writer.writeEndElement();
    } catch (XMLStreamException e) {
      throw new EntityProviderProducerException(EntityProviderException.COMMON, e);
    } catch (EdmSimpleTypeException e) {
      throw new EntityProviderProducerException(e.getMessageReference(), e);
    }
  }

  String getUpdatedString(final EntityInfoAggregator eia, final Map<String, Object> data)
      throws EdmSimpleTypeException, EntityProviderProducerException {
    Object updateDate = null;
    EdmFacets updateFacets = null;
    EntityPropertyInfo updatedInfo = eia.getTargetPathInfo(EdmTargetPath.SYNDICATION_UPDATED);
    if (updatedInfo != null) {
      updateDate = data.get(updatedInfo.getName());
      if (updateDate != null) {
        updateFacets = updatedInfo.getFacets();
      }
    }
    if (updateDate == null) {
      updateDate = new Date();
    }
    try {
      return EdmDateTimeOffset.getInstance().valueToString(updateDate, EdmLiteralKind.DEFAULT, updateFacets);
    } catch (final EdmSimpleTypeException e) {
      throw new EntityProviderProducerException(
          EdmSimpleTypeException.getMessageReference(e.getMessageReference()).
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