计算javascript中两个日期时间之间的持续时间

Question

我需要计算 JavaScript 中两个日期时间之间的持续时间。我试过这个代码：

var today = new Date();
var dd = today.getDate();
var mm = today.getMonth()+1; //January is 0!

var yyyy = today.getFullYear();
if(dd<10){dd='0'+dd} if(mm<10){mm='0'+mm} today = mm+'/'+dd+'/'+yyyy;  //Current Date
console.log("current date"+today);


var valuestart ="8:00 AM";
var valuestop = "4:00 PM";//$("select[name='timestop']").val();

//create date format          
var timeStart = new Date("01/01/2007 " + valuestart).getHours();
var timeEnd = new Date("01/01/2007 " + valuestop).getHours();

var hourDiff = timeEnd - timeStart;             
console.log("duration"+hourDiff);

由此，我可以获得当前日期和持续时间。但是当我用变量“今天”替换日期“01/01/2007”时，我得到的结果为 NaN。请指导我在哪里我错了。提前致谢。

Answer 1

尝试这个 ：

        var today = new Date();
        var dd = today.getDate();
        var mm = today.getMonth()+1; //January is 0!

        var yyyy = today.getFullYear();
        if(dd<10){dd='0'+dd} if(mm<10){mm='0'+mm} today = dd+'/'+mm+'/'+yyyy;  //Current Date

        var valuestart ="8:00 AM";
        var valuestop = "4:00 PM";//$("select[name='timestop']").val();

        //create date format  
        var timeStart = new Date(today + " " + valuestart).getHours();
        var timeEnd = new Date(today + " " + valuestop).getHours();

        var hourDiff = timeEnd - timeStart;  
        alert("duration:"+hourDiff);