Bug 153896 Improve the performance of BIRT datetime-converting
The current datetime converting algorithm in birt.core, xml&flatfile ODA implementations are not efficient enough.This is because we use java's SimpleDateTimeFormatter to parse ISO8601 compatible date/time values. We should write our own datatime string parser for ISO8601 datetime format.
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
/*******************************************************************************
 * Copyright (c) 2004, 2005 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http:www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/
package org.eclipse.birt.core.data;
import java.math.BigDecimal;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Time;
import java.sql.Timestamp;
import java.sql.Types;
import java.text.ParseException;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;
import org.eclipse.birt.core.exception.BirtException;
import org.eclipse.birt.core.format.DateFormatter;