code: public static String format(String format) {
  
          if (format == null) {
              format = DEFAULT_FORMAT;
          } else {
              if (format.contains("M")) {
                  format = format.replace("M", "m");
              }
  
              if (format.contains("Y")) {
                  format = format.replace("Y", "y");
              }
  
              if (format.contains("D")) {
                  format = format.replace("D", "d");
              }
          }
          return format;
      }
docs: Will auto format the given string to provide support for pickadate.js formats.