The Russian government recently announced that Magadan Oblast will be moving from UTC +10:00 hours to UTC +11:00 hours on Sun, Apr 24, 02:00 hours.
Microsoft is preparing an update to Windows which will reflect these changes. We anticipate this update will be made available in the coming months.
Interim Guidance for Magadan Oblast
Though we plan to release a data update, there is insufficient lead before the time change goes into effect. Therefore, we offer the following guidance temporary workaround until such an update can be properly created, tested, distributed, and installed.
Our official policy statement can be found on the site at http://microsoft.com/time.
Until an update is made available, we recommend our customers to continue using time zone “(UTC +10:00) Magadan” until April 24th at 02:00 hours, then switching to "(UTC +11:00) Chokurdah". Selecting this time zone will correctly reflect the time in Magadan Oblast after the change.
After the new update is available and installed, users can then return to the Magadan time zone, which will be updated to show "(UTC +11:00) Magadan". We recommend that our users in the affected regions switch to this new time zone when the update is made available.