Technical data

Setting System Time
6.3 Setting Time Zone Information on OpenVMS VAX Systems
2. Select option 1 to verify the TDF displayed or to enter a new one:
Configuring the Time Differential Factor (TDF)
Enter ? anytime for help
[0] Exit
[1] Set the Time Differential Factor
[2] Display the Time Differential Factor
Please pick an option number [2]: 1
The system then displays the following information:
The Time Differential Factor (TDF) is the difference between your
system time and Coordinated Universal Time (UTC). UTC is similar
in most respects to Greenwich Mean Time (GMT).
The TDF is expressed as hours and minutes, and should be entered
in the hh:mm format. TDFs for the Americas will be negative
(-3:00, -4:00, etc.); TDFs for Europe, Africa, Asia and Australia
will be positive (1:00, 2:00, etc.).
The system displays the following question only if you set the time zone as
well. However, some time zones do not have daylight saving time; if they do
not, the system also does not display this question.
3. Answer Yes or No to the following question:
Is Daylight Saving time in effect? (Yes/No):
4. After the following prompt, either press Return to accept the displayed default
or enter the correct TDF. (If you have not set the time zone, the system does
not display a default TDF value.)
Enter the Time Differential Factor [-4:00]:
The system then explains the need to modify the system time as well for
season time changes:
If this is a seasonal time change, it may also be necessary to
modify the system time. Generally, seasonal time changes result
in adding 1:00 hour, or adding -1:00 hour to the system time.
5. To the following question, answer Yes if you need to modify the local system
time or No if you do not:
Do you wish to modify the local system time [N]:
If you answer Yes, the system leads you through a dialogue similar to the one
in Section 6.5.3
If you answer No, the system next displays the new TDF:
NEW SYSTEM TIME DIFFERENTIAL FACTOR = -4:00.
6. Answer Yes to confirm the displayed TDF or No if it is incorrect:
Is this correct? [Y]:
If you answer No, the system returns to step 1 in this section.
If you answer Yes, the system displays both the TDF and the local system
time.
SYSTEM TIME DIFFERENTIAL FACTOR = -4:00 (-14400 seconds).
LOCAL SYSTEM TIME = 22-JAN-2001 10:52:37.36.
6–12 Setting System Time