This is because you are using Structured Data/Rich Snippets on your pages.
Front page contains many snippets such as:
entry-title: Google PageRank Update History Timeline
entry-content: Google PageRank is the most highly rated and awaited factors on which every blogger keeps a close eye and eagerly wait to see the result of their favorite blog! Looking back, somewhere on a...
published: 2013-05-02
author: fn: Taswir Haider
If you want to remove the time stamp element then you need to remove:
<abbr class="published" title="2013-05-02">May 2, 2013</abbr>
Google is very good at establishing when you up date your pages so regardless if this is in there or not it will have a rough idea. The idea of Rich content is to provide more accurate information as well more information.
You can review your Structured Data Here: https://www.google.com/webmasters/tools/richsnippets?url=http%3A%2F%2Fwww.thetopblogger.com%2F&html=
