How to Send Updated Content With Same URL

[Arjunsinh Chauhan]

Hello, I have a coupon site, and I like to know, how to send same URL(Updated content) to subscriber?

Actually, I can generate ATOM feed easily, like this, but this one does not sent updated content to my subscriber.

<rss xmlns:atom="http://www.w3.org/2005/Atom" version="2.0">

<channel>

<title>My Site title</title>

<description>my description</description>

<link>https://www.example.com/coupons/</link>

<atom:link href="https://www.example.com/feed.xml" rel="self" type="application/rss+xml"/>

<pubDate>Sun, 11 Oct 2015 08:13:26 +0000</pubDate>

<lastBuildDate>Sun, 11 Oct 2015 08:13:26 +0000</lastBuildDate>

<item>

<title>promo code 5 August 2015</title>

<description>

<p>

Here I posted Latest Working _____ promo code

<a href="https://www.example.com/coupons/">Click Here</a>

</p>

</description>

<pubDate>Wed, 05 Aug 2015 00:00:00 +0000</pubDate>

<link>https://www.example.com/coupons/</link>

<guid isPermaLink="true">https://www.example.com/coupons/</guid>

</item>

<item>

<title>Promo code 15 october 2015</title>

<description>

<p>

Here I posted Latest Working promo code

<a href="https://www.example.com/coupons/">Click Here</a>

</p>

</description>

<pubDate>Wed, 14 Oct 2015 00:00:00 +0000</pubDate>

<link>https://www.example.com/coupons/</link>

<guid isPermaLink="true">https://www.example.com/coupons/</guid>

</item>

</channel>

</rss>

Do you have any idea about this?