JSP - How do get time to constantly update by ms

Question

I am attempting to write an example JSP page for myself (very new to jsp), and have gone over an example to write one, but how do I get time to consistently update?

here is my snippet of code:

<body>
    <%
        java.text.DateFormat df = new java.text.SimpleDateFormat(
                "HH:mm:ss:SS z MM/dd/yyyy");
        Calendar cal = Calendar.getInstance();
    %>

    <h1>
        Current Date and Time:
        <%=df.format(cal.getTime())%>
    </h1>
</body>

By the way i'm using a tomcat server to deploy this

@smk have you made web development? No? Then please avoid such comments. — Luiggi Mendoza, Mar 21 '13 at 03:37
It's more related to Javascript (client-side) than Java (server-side). — Bhesh Gurung, Mar 21 '13 at 03:53
The tomcat info is not relevant in order to analyze the problem. — Luiggi Mendoza, Mar 21 '13 at 04:05
Alright, I didn't know what anyone needed. I'm freshly new to jsp and web development with stuff like this — Vnge, Mar 21 '13 at 04:10

score 2 · Accepted Answer · edited May 23 '17 at 12:06

2

    function updateYourTime() {
        var now = new Date(), 
            months = ['January', 'February', '...']; 
            time = now.getHours() + ':' + now.getMinutes(), 

            date = [now.getDate(), 
                    months[now.getMonth()],
                    now.getFullYear()].join(' ');

        document.getElementById('currentTime').innerHTML = [date, time].join(' / ');

        setTimeout(updateYourTime, 1000);//This method will call for every second
    }
    updateYourTime(); // initial call

see here for details

<div id="currentTime"></time>

edited May 23 '17 at 12:06

Community

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1

answered Mar 21 '13 at 03:50

PSR

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@Vnge did you checked my answer – PSR Mar 21 '13 at 03:53
how do i call the js function from my jsp? – Vnge Mar 21 '13 at 04:16
@Vnge in script tag write updateYourTime(); .It will call automatically – PSR Mar 21 '13 at 04:18
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/26595/discussion-between-vnge-and-psr) – Vnge Mar 21 '13 at 04:45

score 0 · Answer 2 · answered Mar 21 '13 at 03:48

0

do you mean to show clock in your pages?

you can use java script. here is an example

answered Mar 21 '13 at 03:48

Daniel Robertus

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score 0 · Answer 3 · answered May 05 '15 at 12:32

to show server clock in clients jsp use this javascripcode with java

Add a label where ever you want to show the server Time

<strong>Server Time&nbsp;:&nbsp;&nbsp;</strong><label id="timelable"></label>

And then add the following java script code at the end of the jsp inside the body tag

<script type="text/javascript">
        var myVar = setInterval(function(){ myTimer() }, 1000);
        var jsVar=  <%=java.util.Calendar.getInstance().getTimeInMillis()%>;
        var timeZoneOffset=<%=java.util.TimeZone.getDefault().getOffset(System.currentTimeMillis())%>;

        jsVar=jsVar+timeZoneOffset;
        function myTimer() {
        jsVar=jsVar+1000;
        var d = new Date(jsVar);
        var t=d.toUTCString();
    document.getElementById("timelable").innerHTML = t;
}

        </script>

Thats it now you will see the server time running in you jsp.

JSP - How do get time to constantly update by ms

3 Answers3