How to insert the last updated time-stamp in Jekyll page at build time?
<p>I would like to automatically insert a last updated timestamp (Not the <code>date</code> variable for the page) for each post at Jekyll build time, how to achieve that? I think I have to declare a variable but I am not sure how to assign the value to that variable.</p>

<p>For example, some time I update an old post, beside showing the post date, I also want to show the last update date.</p>

<p>I have tried <code>{{Time.now}}</code> but seems does not work.</p>