For some reason when I access the celery's tasks page in the Django's admin (.../djcelery/taskstate/), I got this error:
Database returned an invalid value in QuerySet.datetimes(). Are time zone definitions for your database and pytz installed?
I have to do the following to get rid of the error:
1. Uncomment these settings:
# CELERY_TIMEZONE = 'UTC'
# CELERY_ENABLE_UTC = True
2. Add this under mysqld section in /etc/mysql/my.cnf:
default-time-zone = "+07:00"
3. Run the following command (without sudo):
$ mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql
4. Restart mysql:
$ sudo service mysql restart