To many people, Microsoft Outlook really seems bad at handling time zone changes, and that's being kind. This is in part because people don't understand that Outlook uses UTC time for appointments and adjusts the time using the time zone offset configured on the computer.
Note that this is not "an Outlook problem", as this is how computers, email clients and mail servers handle time zones.
For example, any email client will display this sent time:
Thu, 9 Jun 2005 08:16:24 -0700
on a computer configured for the Eastern Time Zone, which has a -0400 offset during Daylight savings time.
By storing all times as UTC, Outlook doesn't need to store any other time information in the appointment and uses the local time zone when rendering the view. This allows someone in another time zone to create a meeting request and it will reflect the correct local time.
Outlook does not support an absolute time option for the calendar, which would permit you to enter 2 PM and the appointment would always stay on 2 PM, no matter how many times you changed the time zone.
Older versions don't have an option for 'in what time zone?' so that you could make an appointment for 2 PM and select Pacific time zone and it would show up as 5 PM in your calendar when the computer is using the Eastern time zone. Outlook 2007/2010 allows you to select the time zone the appointment will be held in.
At the end of this article, we have a short list of clock utilities that will display multiple time zones, many more are available at your favorite Windows shareware sites. These are the ones I've used and like. In most cases, you'll want to disable the Windows tray clock when you use these, to avoid confusion.
There are ways to make Outlook's use of UTC and time zone offsets time less frustrating with older versions of Outlook.
- Learn to use Outlook's dual time zone feature.
- Use a 3rd party clock utility to display 'local' time so you don't have to change the time zone on the computer.
Tip: Never change the computer time to match the 'local' time and leave the time zone set for your home time.
You can easily swap the system time between these two zones, if you need to. I prefer to leave the computer time zone alone though and use a clock utility to display the time in a different zone, in part so all day events stay on one day.
To turn on dual time zone display, go to Tools, Options, Preferences tab, Calendar Options, Time Zone button and add a second time zone. Now when you view the calendar in a day planner format, you'll see two time scales displayed. You can right click on the scale and choose Time zones... to change zones or swap them.
Dual Time Zone Method
I travel to multiple time zones. My meetings happen across many zones, so I always schedule per California time. I wish there was a simple drop-down menu that I could configure to allow me to reset my system to India or China or... time without going to the calendar menu and swapping location. I have so many more than two locations that I have to set up the swap function every time I get to a new country so that my system, calendar and alarms work with my new location's time zone.
Because Outlook gets the time zone from Windows and uses the Windows zone as its default time zone, you don't need to go into Outlook to change the zones, you can do it from Windows, which can be done from a command line in a couple of steps:
- Press Windows Key + R to open the Run command,
- Type or paste the following in the command field (using the desired time zone name) and press Enter
TZUTIL /s "Pacific Standard Time"
Windows 7 saves at least the last 27 entries in the Run command so once you use a command, it can be selected the next time you need to change the zone.
Use Outlook's dual time zone feature and name the Default zone "Current" or something so you know it's not a specific zone then set the second zone to your home time zone and name it accordingly.
Fix Appointment Times
If you create appointments when the computer clock is set for the wrong time zone, or if you move to a new time zone, you can't change the time zone without messing up the appointment times and all day appointments will span two days. You can export the calendar to a non-Outlook format (Excel or CSV works well), then change the time zone settings and import the items back into Outlook.
- Set the computer's time zone and daylight time settings so the appointment times are correct.
- Go to File, Import and Export and follow the wizard to export the calendar to an Excel or CSV format file. Do not export to a PST.
- Correct the computer's time zone and daylight time settings so the time zone is correct for your location.
- Create a new calendar folder in your mailbox, if desired, and move the calendar items to it. Otherwise, delete them.
- Import the calendar items you exported earlier.
- When you are satisfied that the appointments are correct, delete the new calendar folder and all of the old appointments in it.
Michael had this to say about time issues affecting Outlook users in a Citrix environment:
This is a fairly common issue being reported in relation to Outlook, but the Citrix solution is actually quite simple; We recently came across the issue on XenApp6 where the 'use local client time' policy wasn't applying. AD GPO worked for the host OS, but not within published apps. We managed to discover that the issue could be resolved by assigning the 'use local client time' policy through AMC / Delivery Service Console, not just the Citrix client policy.
Always use the correct time zone and DST settings for your location. If your time zone does not honor DST, don't choose a time zone with the correct offset and disable DST.
The following is from Scott in the Cayman Islands. They use the same time zone as Bogota but feel the Bogota time zone name makes them look untrustworthy, so they used Eastern US instead and disabled DST. This caused issues with appointments and I suggested they edit the time zone name in the registry to add their location. The keys are at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\.
Thank you for your feedback. With the information you provided I was able to find a working solution. Unfortunately changing the name did not seem to work as well as I had hoped as the old name would still creep in. But the idea was spot on! I simply created a NEW time zone called Cayman Islands and set it up with the same settings as Bogota'. I used the TZEDIT tool found here: Time Zone Editor to create the time zone.I then created a script to push this to all my desktops overnight, and manually added the hive on the relevant servers. Tests internal and external show what I would expect to see even across Time Zones. The fact that my "Cayman Islands" zone is not on outside computers does not appear to be an issue as it is seems to Use TZ information sent and not an internal reference based on a name. (as I would expect)
Never change the computer's time and leave it on your home time zone. You may not be able to connect to network resources if the time is off by more than a few minutes. Servers pay a lot of attention to the time zone offset - the servers don't care if your machine is set for London's time zone while in Seattle, as long as the time is correct for your time zone offset.
It's also very annoying to other users if you send an email dated hours before or after you really sent it.