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How do I get the difference between two Dates in JavaScript?

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北海茫月
北海茫月 2020-11-22 03:03

I\'m creating an application which lets you define events with a time frame. I want to automatically fill in the end date when the user selects or changes the start date.

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  • 予麋鹿
    2020-11-22 04:06 
    <html>
<head>
<script>
function dayDiff()
{
     var start = document.getElementById("datepicker").value;
     var end= document.getElementById("date_picker").value;
     var oneDay = 24*60*60*1000; 
     var firstDate = new Date(start);
     var secondDate = new Date(end);    
     var diffDays = Math.round(Math.abs((firstDate.getTime() - secondDate.getTime())/(oneDay)));
    document.getElementById("leave").value =diffDays ;
 }
</script>
</head>
<body>
<input type="text" name="datepicker"value=""/>
<input type="text" name="date_picker" onclick="function dayDiff()" value=""/>
<input type="text" name="leave" value=""/>
</body>
</html>
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  • 萌比男神i
    2020-11-22 04:08

    Thanks @Vincent Robert, I ended up using your basic example, though it's actually newBegin + oldEnd - oldBegin. Here's the simplified end solution:

        // don't update end date if there's already an end date but not an old start date
    if (!oldEnd || oldBegin) {
        var selectedDateSpan = 1800000; // 30 minutes
        if (oldEnd) {
            selectedDateSpan = oldEnd - oldBegin;
        }

       newEnd = new Date(newBegin.getTime() + selectedDateSpan));
    }
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  • 闹比i
    2020-11-22 04:08

    If you don't care about the time component, you can use .getDate() and .setDate() to just set the date part.

    So to set your end date to 2 weeks after your start date, do something like this:

    function GetEndDate(startDate)
{
    var endDate = new Date(startDate.getTime());
    endDate.setDate(endDate.getDate()+14);
    return endDate;
}

    To return the difference (in days) between two dates, do this:

    function GetDateDiff(startDate, endDate)
{
    return endDate.getDate() - startDate.getDate();
}

    Finally, let's modify the first function so it can take the value returned by 2nd as a parameter:

    function GetEndDate(startDate, days)
{
    var endDate = new Date(startDate.getTime());
    endDate.setDate(endDate.getDate() + days);
    return endDate;
}
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  • 温柔的废话
    2020-11-22 04:08

    If using moment.js, there is a simpler solution, which will give you the difference in days in one single line of code.

    moment(endDate).diff(moment(beginDate), 'days');

    Additional details can be found in the moment.js page

    Cheers, Miguel

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