HEX2DEC Function

HEX2DEC.js

// Copyright (c) 2012 Sutoiku, Inc. (MIT License)

function HEX2DEC(number) {
  // Return error if number is not hexadecimal or contains more than ten characters (10 digits)
  if (!/^[0-9A-Fa-f]{1,10}$/.test(number)) return '#NUM!';

  // Convert hexadecimal number to decimal
  var decimal = parseInt(number, 16);

  // Return decimal number
  return (decimal >= 549755813888) ? decimal - 1099511627776 : decimal;
}