Editor's note (3.31.2023): This article has been updated to provide additional clarity and guidance on time-zone mapping, and to include links to the KB articles offering the time zone fix.
As ...
Updated Mar 31, 2023
Version 2.0
Blog Post
"After installing February 2023 Cumulative Update preview I can't see any Time Zone called Ciudad_Juarez"
In PowerShell it would look like this, as the update preview hasn't been released yet for the https://support.microsoft.com/en-us/topic/windows-11-update-history-ec4229c3-9c5f-4e75-9d6d-9025ab70fcce
PS C:\Windows\system32> Get-TimeZone -ListAvailable | Format-Table Id -Wrap -AutoSize | Out-String -Stream | Select-String -Pattern "Mexico"
Pacific Standard Time (Mexico)
Mountain Standard Time (Mexico)
Central Standard Time (Mexico)
Eastern Standard Time (Mexico)Let's say you didn't have the latest version of Windows, this feature wasn't automated by software, or you had another operating system, and you had to manually update the clock settings due to lack of support / updates. Daylight savings time in North America really just goes by a fixed set of rules. It's very easy to set up a profile based on a specific month, week, and day ( then you don't have to worry about calculating an offset based on a fixed number of days, which will always be different every year. )
Adjust for Daylight Savings Time: Enabled ( Checked )
Daylight Saving Mode: Recurring
Month: 03 Week: 2nd Day: Sunday Time: 02:00:AM
Month: 11 Week: 1st Day: Sunday Time: 02:00:AM
Daylight Saving Offset: +60 Minutes
Set Date and Time: Auto
"What are the current rules for daylight saving time?
The rules for DST changed in 2007 for the first time in more than 20 years. The new changes were enacted by the Energy Policy Act of 2005, which extended the length of DST in the interest of reducing energy consumption. The rules increased the duration of DST by about one month. DST is now in effect for 238 days, or about 65% of the year, although Congress retained the right to revert to the prior law should the change prove unpopular or if energy savings are not significant. At present, daylight saving time in the United States
begins at 2:00 a.m. on the second Sunday of March (at 2 a.m. the local time time skips ahead to 3 a.m. so there is one less hour in the day)
ends at 2:00 a.m. on the first Sunday of November (at 2 a.m. the local time becomes 1 a.m. and that hour is repeated, so there is an extra hour in the day)"
Daylight Saving Time Rules -> https://www.nist.gov/pml/time-and-frequency-division/popular-links/daylight-saving-time-dst
Windows Time service tools and settings -> https://learn.microsoft.com/en-us/windows-server/networking/windows-time-service/windows-time-service-tools-and-settings
How the Windows Time Service Works -> https://learn.microsoft.com/en-us/windows-server/networking/windows-time-service/how-the-windows-time-service-works
Use Best Practices for Network Time Protocol -> https://www.cisco.com/c/en/us/support/docs/availability/high-availability/19643-ntpm.html
Leap second and UT1-UTC information -> https://www.nist.gov/pml/time-and-frequency-division/time-realization/leap-seconds
Time, technology and leaping seconds -> https://googleblog.blogspot.com/2011/09/time-technology-and-leaping-seconds.html
Google Public NTP - Leap Smear -> https://developers.google.com/time/smear
IERS News -> https://www.iers.org/IERS/EN/NewsMeetings/News/news.html
NIST Internet Time Service (ITS) -> https://www.nist.gov/pml/time-and-frequency-division/time-distribution/internet-time-service-its