fromISO8601

function fromISO8601(str) {
  var o = function(s) { return (s || '+') == '-' ? -1 : 1 } // Offset (pos/neg)
    , i = function(s) { return s ? parseInt(s, 10) : 0; }    // Integer (smart 0 handling)
    , m = str.match(/(\d\d\d\d)-(\d\d)-(\d\d)(?:[T ](\d\d):?(\d\d):?(\d\d)?(?:Z?([+-]?)(\d\d):?(\d\d)?)?)?/)
    , d = new Date()
    ;

  d.setUTCFullYear(i(m[1]));
  d.setUTCMonth(i(m[2]));
  d.setUTCDate(i(m[3]));
  d.setUTCHours(i(m[4]) + o(m[7]) * i(m[8]));
  d.setUTCMinutes(i(m[5]) + o(m[7]) * i(m[9]));
  d.setUTCSeconds(i(m[6]));

  return d;
}

console.log(fromISO8601("2010-09-09"));
console.log(fromISO8601("2010-09-09 12:34Z"));
console.log(fromISO8601("2010-09-09 12:34:01Z"));
console.log(fromISO8601("2010-09-09T12:34Z"));
console.log(fromISO8601("2010-09-09T12:34+01"));
console.log(fromISO8601("2010-09-09T12:34-01"));
console.log(fromISO8601("2010-09-09T12:34+0130"));
console.log(fromISO8601("2010-09-09T12:34+01:30"));
console.log(fromISO8601("2010-09-09T12:34-0130"));
console.log(fromISO8601("2010-09-09T12:34-01:30"));