Bug 158947 the error of the datetime type conversion
Description: Now we input "Jan 13, 2003 12:00 AM GMT0100" into the parameter as a default value. The time is not transformed base on the time zone "GMT0100". The time should be transformed. And the other form input e.g. "SUN Jan 13, 2003 12:00 AM GMT0100" should be identified correctly. Step to reproduce: 1. new a report and create a report parameter 2. choose the date type "DateTime" 3. input value "SUN Jan 13, 2003 12:00 AM GMT0100" as default value,ok to finish 4. error message appear 5. input value "SUN Jan 13, 2003 12:00 AM" and click ok Actuate result: the parameter value is still "01/13/2003 12:00:00 AM" Excepted result: the datetime value should be transformed base on the time zone.
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
* Number -> String
	 * 		Number.toString()
	 * Boolean -> String
	 * 		Boolean.toString()
	 * Date	-> String
	 * 		toString(Date,locale)
	 * @param source
	 * @return
	 * @throws BirtException
	 */
	public static String toString( Object source, ULocale locale )
			throws BirtException
	{
		if ( source == null )
			return null;
		if ( source instanceof Date )
		{
			return toString( (Date) source, locale );
		}
		else
		{
			String str = "";
			if ( source instanceof byte[] )
			{
				final int strLength = 8;
				byte[] sourceValue = (byte[]) source;
				int length = Math.min( sourceValue.length, strLength );
				for ( int i = 0; i < length; i++ )
				{
					str += Integer.toHexString( sourceValue[i] ).toUpperCase( )