1. 将格式为2016-09-09 12:00:00转化为 2016-09-08 12:00:00，将固定时间格式减一天转化方法，
    通过字符串拼接的方式进行组合，可以模仿进行转化。
      var endTime = '2016-09-09 12:00:00';
      var date = new Date(Date.parse(endTime.replace(/-/g, "/")));             
      var dateStartTime = date.getTime()-24*3600*1000;                         
      var d=new Date(dateStartTime);
      var seperator1 = "-";
      var seperator2 = ":";                                                    
      var month = d.getMonth() + 1;                                            
      var strDate = d.getDate();
      if (month >= 1 && month <= 9) {                                          
          month = "0" + month;
      }     
      if (strDate >= 0 && strDate <= 9) {
          strDate = "0" + strDate;                                             
      }                                                                        
      var strHour = d.getHours();
      var strMinute = d.getMinutes()-1;                                        
      if (strHour >= 0 && strHour <= 9) {
          strHour = "0" + strHour;
      }
      if (strMinute >= 0 && strMinute <= 9) {                                  
          strMinute = "0" + strMinute;                                         
      }
      startTime = d.getFullYear() + seperator1 + month + seperator1 + strDate  
          + " " + strHour + seperator2 + strMinute                             
          + seperator2 + '00';                                                 
  结果： startTime = '2016-09-08 12:00:00';