var url = 'http://dte-feed.blogspot.com/feeds/posts/summary?alt=json-in-script&callback='; // Function to load a `<script>` tag without `document.write` function load(url) { var script = document.createElement('script'); script.src = url; document.head.appendChild(script); } // Get the first and last post year… function getFirstAndLastYear($) { $ = $.feed || {}; var entry = $.entry || [], range = {}; // Get the first post year from `json.feed.entry[i].published.$t` value range[0] = entry[0] && +entry[0].published.$t.split('-')[0] || false; // Get the last post year from `json.feed.updated.$t` value range[1] = +$.updated.$t.split('-')[0]; // [3]. Result will be available in the `range` variable as `[from, to]` format console.log(range); // You can now do stuff using the `range` variable start from here document.getElementById('blog-history').innerHTML = '\u00A9 Copyright ' + range[0] + ' \u2013 ' + range[1]; } // Get the total posts… function getTotalPosts($) { $ = $.feed || {}; var i = $.openSearch$totalResults.$t, entry = $.entry || []; // [2]. Get the first and last post year… // Use the `max-results` and `start-index` parameter to limit the posts load(url + 'getFirstAndLastYear&max-results=1&start-index=' + i); } // [1]. Get the total posts… load(url + 'getTotalPosts&max-results=0');