关于ARCGIS the system clock has been set back more than 24 hours的问题（转载自ESRI资源）

Article ID:	24575
Software:	ArcInfo Workstation 7.2.1, 8.0.1, 8.0.2, 8.1, 8.1.2, 8.2, 8.3, 9.0, 9.1, 9.2, 9.3, 9.3.1, 10 ArcGIS - ArcEditor 8.1, 8.1.2, 8.2, 8.3, 9.0, 9.1, 9.2, 9.3, 9.3.1, 10 ArcGIS - ArcInfo 8.0.1, 8.0.2, 8.1, 8.1.2, 8.2, 8.3, 9.0, 9.1, 9.2, 9.3.1, 10 ArcGIS - ArcView 8.1, 8.1.2, 8.2, 8.3, 9.0, 9.1, 9.2, 9.3, 9.3.1, 10
Platforms:	Windows NT 4.0, 2000, XP, Server 2003, Vista, Server 2008, Windows 7

Error Message

Starting an Esri software product may return the following error: 

"The System Clock has been set back to the past. This is not allowed!"

Cause

Any action that puts future-dated files on the license manager server results in the error message shown above. Setting the system clock to the past, setting the clock ahead and then back to the present, or getting future-dated files from another source are
all examples of such an action. 


 Setting the clock back does not cause this error if the user has a permanent license. The
software can still be launched.

Solution or Workaround

Verify that the date and time on the system are correct. Also verify that AM or PM is set properly. -show
me-

Click Start > Settings > Control Panel > Date and Time.

Verify that the time zone is correct. -show
me-

Windows NT and 2000:  1. Click Start > Settings > Control Panel > Date and Time.  2. Select the Time Zone tab.  Windows XP:  1. Select Start > Control Panel > Date and Time.  2. Select the Time Zone tab.  Windows 7:  1. Click Start > Control Panel > Date and Time.  2. Under Time zone, click the 'Change time zone' button.

Reboot the computer and start ArcMap. If problem persists, move to Step 4.

Verify that there are no hidden files and folders. -show
me-

Windows NT:  1. Right-click the My Computer icon on the desktop and select Explore.  2. Select View > Options.  3. On the View tab verify that:  ▪ 'Show all files' is selected.  ▪ 'Hide files of these types' is unselected.  ▪ 'Hide file extensions for known file types' is unselected. 4. Click Apply and OK.  Windows 2000:  1. Right-click the My Computer icon on the desktop and select Explore.  2. Select Tools > Folder Options.  3. On the View tab verify that:  ▪ 'Show hidden files and folders' is selected.  ▪ 'Hide file extensions for known file types' is unchecked.  ▪ 'Hide protected operating system files (Recommended)' is unchecked. 4. Click Yes when prompted.  5. Click Apply and OK.  Windows XP:  1. Right-click the My Computer icon on the desktop and select Explore.  2. Select Tools > Folder Options.  3. On the View tab verify that:  ▪ 'Show hidden files and folders' is selected.  ▪ 'Hide file extensions for known file types' is unchecked.  ▪ 'Hide protected operating system files (Recommended)' is unchecked. 4. Click Yes when prompted.  5. Click Apply and OK.  Windows 7:  1. Click Start > Control Panel > Folder Options.  2. On the View tab and verify that:  ▪ 'Show hidden files, folders, and drives' is selected.  ▪ 'Hide extensions for known file types' is unchecked.  ▪ 'Hide protected operating system files (Recommended)' is unchecked. 3. Click Yes in the Warning dialog when prompted to display hidden files.  4. Click Apply and OK.

 This step is not necessary in Version 10 and later versions. Setting the clock back to
the current date and time should resolve the error.

Search the computer's hard drive for files with future file dates. -show
me-

Windows NT:  1. Select Start > Find > Files or Folders.  2. Select the Date Modified tab and choose Select between.  3. Type in tomorrow's date and 12/31/2099.  4. Click Find Now.  Windows 2000:  1. Select Start > Search > For Files or Folders.  2. Select Search Options.  3. Check the Date box and select Between.  4. Type in tomorrow's date and 12/31/2098.  5. Click Search Now.  Windows XP:  1. Select Start > Search.  2. Select All Files and Folders.  3. Select Search Options.  4. Check 'When was it modified?' and select Specify Dates.  5. Type in tomorrow's date and 12/31/2098.  6. Click Search Now.  Windows 7:  1. Click Start.  2. In the Search box, type the following: date:> 2/2/11  (This command finds all files created or modified after 2/2/2011; use the current date to search for files with a future date.)

 This step is not necessary in Version 10 and later versions. Setting the clock back to
the current date and time should resolve the error.


 WARNING: The instructions below include making changes to essential parts of your operating
system. It is recommended that you backup your operating system and files, including the registry, before proceeding. Consult with a qualified computer systems professional, if necessary. 

Esri cannot guarantee results from incorrect modifications while following these instructions; therefore, use caution and proceed at your own risk.

Remove all files and folders whose time/date stamp is greater than 4 hours ahead of the current system time and date. This may require moving them onto another workstation,
reloading applications, or in the case of system files, it may be necessary to reinstall the operating system. 


 Though alternatives may be available, Esri Technical Support cannot provide or support
the use of them. If there are further questions regarding the information in this article contact Esri Technical Support, otherwise direct all other inquiries to an Esri regional representative.

Created: 2/25/2003
Last Modified: 2/8/2012

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