fixing iso date parsing for Fx and IE/Safari

JavaScript

Date.fromISO= (function(){
    var testIso = '2011-11-24T09:00:27+0200';
    // Chrome
    var diso= Date.parse(testIso);
    if(diso===1322118027000) return function(s){
        return new Date(Date.parse(s));
    }
    // JS 1.8 gecko
    var noOffset = function(s) {
      var day= s.slice(0,-5).split(/\D/).map(function(itm){
        return parseInt(itm, 10) || 0;
      });
      day[1]-= 1;
      day= new Date(Date.UTC.apply(Date, day));  
      var offsetString = s.slice(-5)
      var offset = parseInt(offsetString,10)/100; 
      if (offsetString.slice(0,1)=="+") offset*=-1;
      day.setHours(day.getHours()+offset);
      return day.getTime();
    }
    if (noOffset(testIso)===1322118027000) {
       return noOffset;
    }  
    return function(s){ 
        var day, tz, 
        rx = /^(\d{4}\-\d\d\-\d\d([tT][\d:\.]*)?)([zZ]|([+\-])(\d\d):?(\d\d))?$/,
            
        p= rx.exec(s) || [];
        if(p[1]){
            day= p[1].split(/\D/).map(function(itm){
                return parseInt(itm, 10) || 0;
            });
            day[1]-= 1;
            day= new Date(Date.UTC.apply(Date, day));
            if(!day.getDate()) return NaN;
            if(p[5]){
                tz= parseInt(p[5], 10)/100*60;
                if(p[6]) tz += parseInt(p[6], 10);
                if(p[4]== "+") tz*= -1;
                if(tz) day.setUTCMinutes(day.getUTCMinutes()+ tz);
            }
            return day;
        }
        return NaN;
    }
})()

var targetDate = Date.fromISO("2012-02-10T13:19:11+0000");
var targetDateWithoutOffset = targetDate - new Date().getTimezoneOffset() * 1000;
alert(targetDateWithoutOffset);