Time Stamp Errors Running Windows NT on an AS/400-Based Computer

• Microsoft Windows NT Server version 4.0
• Microsoft Exchange Server, version 5.5

SYMPTOMS

When you view documents or e-mail messages created on Microsoft Windows 98/95 client computers and stored on an IBM AS/400-based computer that is using an Integrated PC Server (IPCS) adapter to run Windows NT, your documents or e-mail messages may have time discrepancies of 1-2 hours between the document creation or modification time on a client workstation and the same time values recorded on the server.

CAUSE

This behavior can occur if Daylight Savings Time has altered the time. IPCS adapters do not contain a system clock, but instead depend on time information provided by the AS/400-based computer. AS/400-based computers and the OS/400 operating system do not automatically adjust for Daylight Savings Time.

RESOLUTION

To work around this behavior, at the beginning and ending of Daylight Savings Time reset the AS/400 Local Time Offset from Greenwich Mean Time (GMT) by modifying the value of the "QUTCOFFSET" registry setting on the AS/400-based computer.

MORE INFORMATION

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The system administrator of the AS/400-based computer must manually adjust the System Registry to reset the current "Time Offset" on the computer from GMT. Note that GMT is also known as Universal Time Code (UTC). For example, during Eastern Standard Time (EST), local clocks are set 5 hours earlier than GMT. However, because GMT is not adjusted for Daylight Savings Time, servers in the Eastern time zone must be adjusted by an additional hour during the period known as Eastern Daylight Time. Because of this, the "normal" offset of minus 5 hours for the Eastern Time Zone should be adjusted to minus 6 hours during Daylight Savings Time.

This adjustment is processed automatically at the beginning and end of Daylight Savings Time with Windows 98/95-based workstations and Windows NT-based workstations and servers. However, on AS/400-based computers, the system administrator must modify the AS/400 "QUTCOFFSET" registry setting at the beginning and end of Daylight Savings Time. If the administrator does not make these adjustments on the AS/400-based computer, date and time stamps on documents and e-mail messages are displayed with different values, depending on whether they are viewed from the server or the workstation. For information about how to modify this registry setting, please contact IBM technical support.

If the "Adjust For Daylight Savings" feature is not enabled on the Windows 98/95-based or Windows NT-based computer, the time variance is 1 hour. If the "Adjust For Daylight Savings" feature is enabled on the Windows 98/95-based or Windows NT-based computer, the time variance is 2 hours.

For IBM AS/400 technical information, please see the following IBM Web site:

http://AS400Service.Rochester.IBM.Com

Additional query words: 2850 2854 2857 2865 2866 2868 6617 6618 zone stamp

Keywords : kb3rdparty kbenv kbinterop kbui exc5 exc55
Version : winnt:4.0,5.5
Platform : winnt
Issue type : kbprb