Javascript date dissapears when I change rails partial

html / haml :

- elsif statement.featured && statement.unanswered(current_user)
    = javascript_include_tag "date"
    %h4#dateDisplay
    %h4.text-left#join_the_conversation_heading WHAT DO YOU THINK?
    .statement_text= statement.text
    = render "responses/response", :statement => statement
    = render "statements/conversation_links", :statement => statement
    .clear

js:

$(document).on("ready page:load", function() {
// this will return the current date in specified format.
    function thisDate() {
        var month = new Array();
        month[0] = "January";
        month[1] = "February";
        month[2] = "March";
        month[3] = "April";
        month[4] = "May";
        month[5] = "June";
        month[6] = "July";
        month[7] = "August";
        month[8] = "September";
        month[9] = "October";
        month[10] = "November";
        month[11] = "December";
        var today = new Date(),
            dd = today.getDate(),
            mm = month[today.getMonth()],
            yyyy = today.getFullYear();
        today = mm + ' ' + dd + ' , ' + yyyy;
        dateDisplay = document.getElementById('dateDisplay');
        dateDisplay.innerHTML = today;
    }

    thisDate();
//
});

whenever I click the next link to the next partial / statement, the date dissapears. It only shows on the first statement / partial when I initially load the page.

I'm not sure why this will show in the initial load an in the main page, but will not consistently display within the partial..