Using jQuery to set a DIV attribute on page load

You have 2 id listed...I changed to the following:

    <script type="text/javascript">
 
  $(function() {
    var d = new Date();
    // in the format you want  
    var strDate = (d.getMonth()+1) + d.getDate() + "/" +  "/" + d.getFullYear() ;

    $( "#dp2" ).attr('data-date', strDate); 
 
  });
</script>

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and got  JavaScript runtime error: '$' is undefined

you need to include the jquery libraries, which i assumed already done as you requested this to be done with jquery...

I do. I have other functions on the same page working fine.

on which line?

Your date string is wrong (line 6)

var strDate = (d.getMonth()+1) + d.getDate() + "/" +  "/" + d.getFullYear() ;

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- I think you meant this

 var strDate = (d.getMonth()+1) + "/" + d.getDate() + "/"  + d.getFullYear() ;

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Make sure your script is included AFTER the jQuery libraries

This works with the above amendment (http://www.marcorpsa.com/ee/t2060.html)

Kind of strange here, I have my libraries referenced in a master page which works good, except for this (and others I presume?) Anyhow, I added the reference again to this page itself and the following works great.

<script type="text/javascript">
    $(document).ready(function () {
        $("#dp3").attr("data-date", Date());
    });
</script>

How does this

var strDate = (d.getMonth()+1) + d.getDate() + "/" +  "/" + d.getFullYear() ;

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Produce this?
mm/dd/yyyy

There is a double "/" + "/" in the string?