code: public static long extractTimestamp64Ascii(String id64ascii) throws NumberFormatException {
          return extractTimestamp64(Long.parseLong(id64ascii, Character.MAX_RADIX));
      }
docs: Extracts the (UNIX) timestamp from a 64-bit ASCII id (radix
  {@link Character#MAX_RADIX}).
  
  @param id64ascii
  @return the UNIX timestamp (milliseconds)
  @throws NumberFormatException