javascript - How to know date is today?

Question

Ask a Question

Welcome To Ask or Share your Answers For Others

javascript - How to know date is today?

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

I am trying this but is not working... why?

<html>
<body>
    <script type="text/javascript">

        var today=new Date(); //today is Nov 28, 2010
        today.setHours(0);
        today.setMinutes(0);
        today.setSeconds(0);
        document.write(today+" ");

        var today2 = new Date("November 28, 2010");
        document.write(today2 + " ");
        if (today == today2) { document.write("==");
        if (!(today > today2) && !(today < today2) ) {document.write("==  ");}
        if (today > today2) { document.write(">  ");}
        if (today >= today2 ){ document.write(">=  ");}
        if (today < today2 ) { document.write("<  ");}
        if (today <= today2 ){ document.write("<=  ");}

    </script>
</body>
</html>

And I always get this:

Sun Nov 28 2010 00:00:00 GMT+0900 (JST) Sun Nov 28 2010 00:00:00 GMT+0900 (JST) > >=

Aren't both dates to be the same? Hence, I should get == printed but is not happening... ;(

Thank you for your help in advance.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…

311 views

1 Answer

深蓝 · Answer 1 · 2021-10-23T19:32:10+0000

They will never match because you're comparing two separate Date object instances.

You need to get some common value that can be compared. For example .toDateString().

today.toDateString() == today2.toDateString();  // true

If you just compare two separate Date objects, even if they have the exact same date value, they are still different.

For example:

today == new Date( today );  // false

They are the same date/time value, but are not the same object, so the result is false.

Categories

javascript - How to know date is today?

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

Please log in or register to add a comment.

Just Browsing Browsing

Most popular tags