add timestamp macro

app/templates/users/user.html

@@ -1,3 +1,4 @@
+{% from 'common/macros.html' import timestamp %}
 {% extends 'base.html' %}
 {% block title %}{{ target_user.username }}'s profile{% endblock %}
 {% block content %}
@@ -17,9 +18,9 @@
   {% if active_user and active_user.is_mod() and not target_user.is_system() %}
     <h1 class="thread-title">Moderation controls</h1>
     {% if target_user.is_guest() %}
-      <p>This user is a guest. They signed up on ... </p>
+      <p>This user is a guest. They signed up on {{ timestamp(target_user['created_at']) }}</p>
     {% else %}
-      <p>This user signed up on ... and was confirmed on ...</p>
+      <p>This user signed up on {{ timestamp(target_user['created_at']) }} and was confirmed on {{ timestamp(target_user['confirmed_on']) }}</p>
     {% endif %}
   {% endif %}
 </div>