code: public static String appendSystemtimeToFilename(final File fileToRename, final Date add2Name)
  	{
  		final String format = "HHmmssSSS";
  		String sysTime = null;
  		if (null != add2Name)
  		{
  			final DateFormat df = new SimpleDateFormat(format);
  			sysTime = df.format(add2Name);
  		}
  		else
  		{
  			final DateFormat df = new SimpleDateFormat(format);
  			sysTime = df.format(new Date());
  		}
  
  		final String fileName = fileToRename.getName();
  		final int ext_index = fileName.lastIndexOf(".");
  		final String ext = fileName.substring(ext_index, fileName.length());
  		String newName = fileName.substring(0, ext_index);
  		newName += "_" + sysTime + ext;
  		return newName;
  	}
docs: Returns the filename from the given file with the systemtime.
  
  @param fileToRename
  The file.
  @param add2Name
  Adds the Date to the Filename.
  
  @return Returns the filename from the given file with the systemtime.