// The path to the documents directory.
String dataDir = Utils.getDataDir(ExtendedAttributes.class);

Project prj = new Project(dataDir + "project5.mpp");
ExtendedAttributeDefinitionCollection eads = prj.getExtendedAttributes();

// Create extended attribute definition
ExtendedAttributeDefinition attributeDefinition = ExtendedAttributeDefinition
        .createTaskDefinition(CustomFieldType.Start, ExtendedAttributeTask.Start7, "Start 7");
prj.getExtendedAttributes().add(attributeDefinition);

eads.add(attributeDefinition);

// Get zero index task
Task tsk = prj.getRootTask().getChildren().getById(1);
ExtendedAttributeCollection eas = tsk.getExtendedAttributes();

// Add extended attribute
ExtendedAttribute ea = attributeDefinition.createExtendedAttribute();
ea.setFieldId(attributeDefinition.getFieldId());

Date date = new Date();
ea.setDateValue(date);

eas.add(ea);

prj.save(dataDir + "Project5.xml", SaveFileFormat.XML);

// Display result of conversion.
System.out.println("Process completed Successfully");