Alberta 2026 time zone update available now

Well, this is turning into a nightmare.  Microsoft has released the patch for Windows 11 and Servers, but there are a many of side-effects.  Here are some of the other items:

• SharePoint Calendars needs to be adjusted.
• Teams code base is inconsistent; you see a mixture of times shifts in the Calendar and Chat Log.
• Teams Rooms - depending if it is Android or Windows, should be checked.
• Google Chrome does not know how to use the new time zone.  (https://support.google.com/chrome/thread/472933334/chrome-incorrectly-detects-alberta-s-new-utc%E2%88%926-timezone-as-utc%E2%88%927?hl=en)
• Apple Calander needs to be checked, if it is connected to Exchange

https://support.microsoft.com/en-us/outlook/calendar/timezone-changes-for-canada-provinces

https://learn.microsoft.com/en-us/answers/questions/6002950/microsoft-bookings-timezone-support-for-british-co

https://devblogs.microsoft.com/azure-sql/canadas-2026-time-zone-updates-guidance-for-microsoft-sql/

https://learn.microsoft.com/en-us/answers/questions/6026743/new-outlook-for-mac-and-outlook-for-ios-display-al

Additionally, this year IsDaylightSavingTime returns TRUE, next year it is FALSE.  Who thinks that will not causes a programming issue.

#Store current time zone value
$tz = Get-TimeZone
$tz

#show before and after values for UTC offset and DST support
$dates = @(
    [datetime]'2026-10-31 12:00',
    [datetime]'2026-11-01 12:00',
    [datetime]'2026-12-01 12:00',
    [datetime]'2027-01-15 12:00',
    [datetime]'2027-07-15 12:00'
)
foreach ($date in $dates){
    [PSCustomObject]@{
        Date      = $date
        UTCOffset = $tz.GetUtcOffset($date)
        IsDST     = $tz.IsDaylightSavingTime($date)
    }
}

#show adjustment rules
$tz.GetAdjustmentRules() | Format-List *

Results in:

Date                   UTCOffset IsDST
----                   --------- -----
10/31/2026 12:00:00 PM -06:00:00  True
11/1/2026 12:00:00 PM  -06:00:00  True
12/1/2026 12:00:00 PM  -06:00:00  True
1/15/2027 12:00:00 PM  -06:00:00 False
7/15/2027 12:00:00 PM  -06:00:00 False