String = "2009-07-31 07:59:17.427"
Date = 2009-07-31 07:59:17.427

Date formatter = new Date(HttpDateParser.parse("2009-07-31 07:59:17.427"));
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
String strCustomDateTime = dateFormat.format(formatter);

public static String StringToDate(String dateToParse) {

	Date formatter = new Date(HttpDateParser.parse(dateToParse));
	SimpleDateFormat dateFormat = new SimpleDateFormat(
			"yyyy-MM-dd HH:mm:ss.SSS");
	int offset = TimeZone.getDefault().getRawOffset();
	formatter.setTime(formatter.getTime() + offset);
	String strCustomDateTime = dateFormat.format(formatter);
	return strCustomDateTime;
}

format.setTimeZone(TimeZone.getTimeZone("your time zone"));