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
{
					throw new BirtException( pluginId,
							ResourceConstants.CONVERT_FAILS,
							new Object[]{
									source.toString( ), "Boolean"
							} );
				}
			}
		}
		else
		{
			throw new BirtException( pluginId,
					ResourceConstants.CONVERT_FAILS,
					new Object[]{
							source.toString( ), "Boolean"
					},
					resourceBundle );
		}
	}
	/**
	 * Number -> Date
	 * 		new Date((long)Number)
	 * String -> Date
	 * 		toDate(String)  
	 * @param source
	 * @return
	 * @throws BirtException
	 */
	public static Date toDate( Object source ) throws BirtException
	{