periodicals: use time instead of p

periodicals/index.html

@@ -8,21 +8,21 @@ title: Revuo Periodical
       
       <li class="post">
 	  	<h2><a href="periodical-5-2020.html">Revuo Periodical #5</a></h2>
-        <p class="by-line">01 Mar 2021</p>
+        <time class="by-line">01 Mar 2021</time>
         <a href="periodical-5-2020.html"><img src="/img/img-periodical-5.png" alt="Revuo Monero Periodical #5 Slide"></a>
 	  	<p>Covering the period of January 1 - December 31, 2020.</p>
 	  </li>
       
       <li class="post">
 	  	<h2><a href="periodical-4-2019.html">Revuo Periodical #4</a></h2>
-        <p class="by-line">29 Jan 2020</p>
+        <time class="by-line">29 Jan 2020</time>
         <a href="periodical-4-2019.html"><img src="/img/img-periodical-4.png" alt="Revuo Monero Periodical #4 Slide"></a>
 	  	<p>Covering the period of July 1 - December 31, 2019.</p>
 	  </li>
       
 	  <li class="post">
 	  	<h2><a href="periodical-3-2019.html">Revuo Periodical #3</a></h2>
-        <p class="by-line">14 Sep 2019</p>
+        <time class="by-line">14 Sep 2019</time>
         <a href="periodical-3-2019.html"><img src="/img/img-periodical-3.png" alt="Revuo Monero Periodical #3 Slide"></a>
 	  	<p>Covering the period of January 1 - June 30, 2019.</p>
 	  </li>