Unix timestamp convert to Gregorian

Hi,

I have created Site Page to display Form ID (in CRX - formID) and to display last modify date from metadata (in CRX jcr:LastModified). These are out of the box metadata information. The page is able to display but the display data does showed up on Unix timestamp (eg. 1571836800000) and not Gregorian (eg. 10-23-2019 08:20). The properties that I am editing are in template.html property through CRXDE Lite( apps/fd/fp/<folder>/template.html ). Is there a way to display information in Gregorian format? Thanks.

Below is an example of template.html.

<table class="m-tab __FP_grid-table __FP_single-color" width="100%" style="table-layout:fixed;" cellpadding="0" cellspacing="0" border="0">
    <thead>
        <tr>
            <th class="__FP_grid_overflow-control-th __FP_grid-name __FP_grid_sort" tabindex="0" data-sortKey="formid">Form ID</th>
            <th class="__FP_grid_overflow-control-th __FP_grid-description __FP_grid_sort" tabindex="0" data-sortKey="jcr:lastModified">${localize-jcr:lastModified}</th>
            <th class="__FP_grid_overflow-control-th __FP_grid-description" tabindex="0">${localize-Actions}</th>
        </tr>
    </thead>
    <tr data-repeatable="true">
        <td class="__FP_grid_overflow-control" title="${formid}" tabindex="0" data-label="${localize-Form ID}">${formid}</td>
<td class="__FP_grid_overflow-control" title="${description}" tabindex="0" data-label="${localize-jcr:lastModified}">${lastModified}</td>

        <td class="__FP_grid_open-download-image" data-label="${localize-Actions}">
            <a style="cursor:pointer;" onclick="javascript:window.open('${formUrl}', '_blank');" class="__FP_panel-html-open ${htmlStyle}" title="${config-htmlLinkText}"></a>
            <a href="https://forums.adobe.com/lc/bin/acsforms/render/renderextend?xdppath=${path}" target="_blank" class="__FP_panel-pdf-open ${pdfStyle}" title="${config-pdfLinkText}"></a>
        </td>
    </tr>
</table>