PLT-4606: Date separator in RHS (#5606)

webapp/components/post_view/components/date_separator.jsx

@@ -0,0 +1,27 @@
+import React from 'react';
+import {FormattedDate} from 'react-intl';
+
+export default class DateSeparator extends React.Component {
+    render() {
+        return (
+            <div
+                className='date-separator'
+            >
+                <hr className='separator__hr'/>
+                <div className='separator__text'>
+                    <FormattedDate
+                        value={this.props.date}
+                        weekday='short'
+                        month='short'
+                        day='2-digit'
+                        year='numeric'
+                    />
+                </div>
+            </div>
+        );
+    }
+}
+
+DateSeparator.propTypes = {
+    date: React.PropTypes.instanceOf(Date)
+};