OL2000: Disabling Time Zone Adjustment for Imported Appointments

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Outlook expresses the time assigned to non-recurring appointments in the imported schedule file as Greenwich mean time (GMT). When importing, Outlook applies the current time zone data to the GMT to compute the actual time to schedule the incoming appointments. Changing the time zone after the import is complete does not affect the time computed during the import process. Therefore, the following procedures will not correct the time of appointments imported with an invalid daylight saving time setting. You must manually correct, or remove and reimport appointments with incorrect times, using the correct time zone and daylight saving time settings.

Clearing the Daylight Saving Time Option

To clear the Daylight Saving Time option, follow these steps:

1. Click Start, point to Settings, click Control Panel and click Date/Time.
2. On the Time zone tab, notice that the check box to "Automatically adjust clock for daylight savings changes" is selected although it is unavailable (grayed out).
3. In the list of time zones, click to select the old time zone that had daylight saving time selected.
4. Click to clear the "Automatically adjust clock for daylight savings changes" check box and click Apply.
5. In the list of time zones, click to select the new time zone that does not support daylight saving time and click Apply.
   
   Notice that the option to "Automatically adjust clock for daylight savings changes" is no longer selected.
6. Click OK.

Modifying the Registry to Turn Off Daylight Saving Time

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).

1. On the File menu, click Exit And Log Off.
2. Click the Start button, and point to Run. In the Open box, type "regedit" (without the quotation marks), and click OK to run the Windows Registry Editor.
3. In the left pane, move to and click to select the following key:
   
   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control \TimeZoneInformation
   
   
4. Right-click the TimeZoneInformation key, point to New and click to select DWORD Value.
5. Type a name of "DisableAutoDaylightTimeSet" (without the quotation marks).
6. Double-click the new DWORD entry and change its value to "1" (without the quotation marks).