I would like to display a published / modified date next to my website on google search result page
Usually, when google crawl your page, will try to find date data. e.g
Google looks specifically for a date just under the first H1 tag
So you can use “schema” to tell google what is your published / modified date
here is example how to use “schema” to display the published / modified date
<time itemprop="datePublished" datetime="2016-04-27T14:03:20+01:00">Published: 27 Apr 16</time> <time itemprop="dateModified" datetime="2016-03-21T14:51:23+01:00">Last Updated: 21 Mar 16</time>