IE下Date 日期不兼容问题

 function parseISO8601(dateStringInRange) {  
      var isoExp = /^\s*(\d{4})-(\d\d)-(\d\d)\s*$/,  
       date = new Date(NaN), month,  
       parts = isoExp.exec(dateStringInRange);  
       if(parts) {  
         month = +parts[2];  
         date.setFullYear(parts[1], month - 1, parts[3]); 
      if(month != date.getMonth() + 1) {  
       date.setTime(NaN);  
        }  
    }  
    return date;  
 }  

parseISO8601(‘2014-06-01‘);