--- a/weather_server/server.py	Fri Nov 01 00:48:56 2019 -0400
+++ b/weather_server/server.py	Sun Nov 10 19:42:04 2019 -0500
@@ -55,11 +55,15 @@
             date = tz.normalize(last_reading.sample_time.astimezone(tz))
         else:
             date = None
+        now = datetime.datetime.now(tz=pytz.UTC)
+        diff = (now - date) if date else None
+        is_recent = diff and diff < datetime.timedelta(hours=12)
         return flask.render_template(
             'location.html',
             location=loc,
             last_reading=last_reading,
-            date=date)
+            date=date,
+            date_format=f'%H:%M' if is_recent else '%Y-%m-%d %H:%M')
 
     @app.route('/<location>/recent')
     def recent(location: str):