Timezone missing in mysql database (celery periodic task)
Ref: https://stackoverflow.com/questions/21351251/database-returned-an-invalid-value-in-queryset-dates#21571350 You have to load timezone tables into mysql ( http://dev.mysql.com/doc/refman/5.6/en/mysql-tzinfo-to-sql.html ). Try execute on your database server: mysql_tzinfo_to_sql / usr / share / zoneinfo | mysql - D mysql - u root - p And then run "flush tables" or "flush query cache", otherwise the problem may not disappear even though you've loaded the correct timezone data: mysql - u root - p - e "flush tables;" mysql