Scheduled tasks page inaccessible: DateTime::__construct(): Failed to parse time string

Symptoms

Scheduled tasks page inaccessible with the following error:

CONFIG_TEXT: Internal error:
DateTime::__construct(): Failed to parse time string (2017-12-20 2.2:0:03) at position 16 (:): Unexpected character

Cause

Plesk bug PPPM-7634 that is planned to be fixed in one of the future product updates.

Resolution

1. Log into the server via SSH .
2. Create a backup of Plesk database:

   # MYSQL_PWD=`cat /etc/psa/.psa.shadow` mysqldump psa -uadmin > psa_current.sql

3. Enter Plesk database:

   # plesk db

4. Find the wrong value by selecting time-related values from ScheduledTasks table:

   MYSQL_LIN: SELECT id,minute,hour,dayOfMonth,month,dayOfWeek FROM ScheduledTasks;
   

   In this example, hour with with id =14 is a wrong one.
5. Update value with id=14:

   MYSQL_LIN: UPDATE ScheduledTasks SET hour=2 WHERE id=14;