adding middleware and use in readthrough template

bookwyrm/settings.py

@@ -66,6 +66,7 @@ MIDDLEWARE = [
     "django.middleware.common.CommonMiddleware",
     "django.middleware.csrf.CsrfViewMiddleware",
     "django.contrib.auth.middleware.AuthenticationMiddleware",
+    "bookwyrm.timezone_middleware.TimezoneMiddleware",
     "django.contrib.messages.middleware.MessageMiddleware",
     "django.middleware.clickjacking.XFrameOptionsMiddleware",
 ]

bookwyrm/templates/snippets/readthrough.html

@@ -1,5 +1,6 @@
 {% load i18n %}
 {% load humanize %}
+{% load tz %}
 <div class="content block">
     <div id="hide-edit-readthrough-{{ readthrough.id }}">
         <div class="columns">
@@ -8,7 +9,7 @@
                 </dl>
                 <ul>
                     {% if readthrough.finish_date or readthrough.progress %}
-                    <li>{% if readthrough.finish_date %} {{ readthrough.finish_date | naturalday }}: {% trans "finished" %} {% else %}{% if readthrough.progress_mode == 'PG' %}on page {{ readthrough.progress }}{% if book.pages %} of {{ book.pages }}{% endif %}
+                    <li>{% if readthrough.finish_date %} {{ readthrough.finish_date | localtime | naturalday }}: {% trans "finished" %} {% else %}{% if readthrough.progress_mode == 'PG' %}on page {{ readthrough.progress }}{% if book.pages %} of {{ book.pages }}{% endif %}
                         {% else %}{{ readthrough.progress }}%{% endif %}{% endif %}
                         {% if readthrough.progress %}
                         {% trans "Show all updates" as button_text %}
@@ -37,7 +38,7 @@
                         {% endif %}
                     </li>
                     {% endif %}
-                    <li>{{ readthrough.start_date | naturalday }}: {% trans "started" %}</li>
+                    <li>{{ readthrough.start_date | localtime | naturalday }}: {% trans "started" %}</li>
                 </ul>
             </div>
             <div class="column is-narrow">

bookwyrm/timezone_middleware.py

@@ -0,0 +1,17 @@
+import pytz
+
+from django.utils import timezone
+
+
+class TimezoneMiddleware:
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        if request.user.is_authenticated:
+            timezone.activate(pytz.timezone(request.user.preferred_timezone))
+        else:
+            timezone.activate(pytz.utc)
+        response = self.get_response(request)
+        timezone.deactivate()
+        return response

bookwyrm/views/reading.py

@@ -7,7 +7,6 @@ from dateutil.parser import ParserError
 from django.contrib.auth.decorators import login_required
 from django.http import HttpResponseBadRequest, HttpResponseNotFound
 from django.shortcuts import get_object_or_404, redirect
-from django.utils import timezone
 from django.views.decorators.http import require_POST
 
 from bookwyrm import models