js计算时间之差

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   var date = form1.txtDate.value;            
            //起始时间
            var startdate = date + " "+form1.txtStartHour.value+":"+form1.txtStartMinute.value+":00";
            //峻工时间
            var enddate = date + " "+form1.txtEndHour.value+":"+form1.txtEndMinute.value+":00";
            
            var startArr = startdate.split(" ");
            var startDay = startArr[0].split("-");//起始日期
            var startTime = startArr[1].split(":");//起始时间
            
            var syy = startDay[0];//起始年
            var smm = startDay[1];//起始月
            var sdd = startDay[2];//起始日
            var shh = startTime[0];//起始时
            var smi = startTime[1];//起始分
            var sse = startTime[2];//起始秒
            
           var endArr = enddate.split(" ");
            var endDay = endArr[0].split("-");//峻工日期
            var endTime = endArr[1].split(":");//峻工时间
            
            var eyy = endDay[0];//峻工年
            var emm = endDay[1];//峻工月
            var edd = endDay[2];//峻工日
            var ehh = endTime[0];//峻工时
            var emi = endTime[1];//峻工分
            var ese = endTime[2];//峻工秒
            
            var startdate = new Date(Date.UTC(syy, smm-1, sdd, shh-8, smi, sse));
            var enddate = new Date(Date.UTC(eyy,emm-1,edd,ehh-8,emi,ese));
            
            
            var fen = ((enddate.getTime()-startdate.getTime())/1000)/60;           
             
             
            form1.txtTotalHour.value = parseInt(fen/60);//得到小时
            form1.txtTotalMinute.value = parseInt((fen % 60)); 得到分钟
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