Dynamically changing javascript code

I have a <div> that contains a date:

<div id="editDateDiv">10/20/16</div>

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I want to grab that date and update the date on line 5 of the following jQuery code upon clicking a <td>:

$("#addNew").on("mouseup", function() {
     $(this).css("background", "white");
     $(this).css("color", "#008bab");
     $("#editDateDiv").html("Add New...");
     $("#currentAppts").load("calendar_appNew.cfm?appDate=10/12/2016");
});

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How can I accomplish this?