Add Омск (Россия) to your list and use my-locations table to visually convert it's time to another timezone or city time.
Mouse over the colored hour-tiles and glance at the hours selected by the column.

Current time zone for Омск (Россия) is Asia/Omsk, whose offset is GMT+6 from Greenwich Mean Time (GMT).

The IANA timezone identifier for Омск, Россия is "Asia/Omsk"

It currently does not observe Daylight Savings Time.