- Plesk Onyx 17.5 for Linux
If timezone is set as "Asia/Seoul (UTC, +09.00)" via Plesk tab Tools & Settings > System time > specify time zone as Asia/Seoul (UTC, +09.00) time zone is shown as "Asia / Pyongyang ( (UTC, +09.00)" in Domains > example.com > Scheduled tasks > Settings.
Debian or Ubuntu is installed no the server.
Bug with ID PPPM-8382 which will be fixed in next product updates.
Set another time with required time offset (+09.00).