Revert "#5108 Use <time> element for channel headers and search result headers" (#5359)

webapp/components/post_view/components/post_list.jsx

@@ -354,7 +354,7 @@ export default class PostList extends React.Component {
                 />
             );
 
-            const currentPostDay = new Date(Utils.getDateForUnixTicks(post.create_at).setUTCHours(0, 0, 0, 0));
+            const currentPostDay = Utils.getDateForUnixTicks(post.create_at);
             if (currentPostDay.toDateString() !== previousPostDay.toDateString()) {
                 postCtls.push(
                     <div
@@ -363,7 +363,6 @@ export default class PostList extends React.Component {
                     >
                         <hr className='separator__hr'/>
                         <div className='separator__text'>
-                            <time dateTime={currentPostDay.toISOString()}>
                             <FormattedDate
                                 value={currentPostDay}
                                 weekday='short'
@@ -371,7 +370,6 @@ export default class PostList extends React.Component {
                                 day='2-digit'
                                 year='numeric'
                             />
-                            </time>
                         </div>
                     </div>
                 );

webapp/components/search_results_item.jsx

@@ -286,20 +286,17 @@ export default class SearchResultsItem extends React.Component {
             );
         }
 
-        const postCreateDate = new Date(Utils.getDateForUnixTicks(post.create_at).setUTCHours(0, 0, 0, 0));
         return (
             <div className='search-item__container'>
                 <div className='date-separator'>
                     <hr className='separator__hr'/>
                     <div className='separator__text'>
-                        <time dateTime={postCreateDate.toISOString()}>
                         <FormattedDate
-                                value={postCreateDate}
+                            value={post.create_at}
                             day='numeric'
                             month='long'
                             year='numeric'
                         />
-                        </time>
                     </div>
                 </div>
                 <div