JSFiddle - React, Tailwind, and code Playground

HTML

<div class="data-dston">
</div>
<br>
<div class="data-dstoff">
</div>

JavaScript

// set the date to 11 / 04 / 2012 at 00:00 UTC
var date = new Date(1331424000000);
for(var i = 1; i <= 12; i++)
{   
    $('.data-dston').append(' ' + date.getHours() + ':00, ');
    date = new Date(date.getTime() + 3600000)
}

// set the date to 04 / 11 / 2012 at 00:00 UTC
var date = new Date(1351987200000);
for(var i = 1; i <= 12; i++)
{   
    $('.data-dstoff').append(' ' + date.getHours() + ':00, ');
    date = new Date(date.getTime() + 3600000)
}