Bug 130688 ULocal unsupported(Data)
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DateUtil.java
private static GregorianCalendar calendarInstance = null;
	
	/**
	 * All possible split char in differnt Locales.
	 * '/'
	 * 	Locale_US
	 * 	Locale_UK
	 * 	...
	 * '-'
	 * 	Locale_CHINA
	 * '.'
	 * 	Locale_GERMAN
	 */
	private static String[] splitStrs = new String[]{
			"/", "-", "."
	};
	
	/**
	 * Check whether dateStr can be correctly converted to Date in 
	 * format of DateFormat.SHORT. Here one point must be noticed that
	 * dateStr should firstly be able to be converted to Date.
	 * 
	 * @param df
	 * @param dateStr
	 * @return checkinfo
	 */
	public static boolean checkValid( DateFormat df, String dateStr )
	{
		assert df != null;
		assert dateStr != null;