Add Timezone setting/pref & Update tests accordingly

docker/docker-compose.yml

@@ -13,6 +13,10 @@ services:
       # You can leave this on "local". If you change it to production most console commands will ask for extra confirmation.
       # Never set it to "testing".
       - APP_ENV=local
+      # The timezone for your application, which is used to record dates and times to database. This global setting can be
+      # overridden by users via in-app settings for a personalised dates and times display.
+      # If this setting is changed while the application is already running, existing records in the database won't be updated
+      - APP_TIMEZONE=UTC
       # Set to true if you want to see debug information in error screens.
       - APP_DEBUG=false
       # This should be your email address