Technical data

Setting System Time
6.5 Adjusting for Daylight Saving Time
• Queue a batch job to make the changes at a future time. (This is the most
common use of this command procedure.)
The following example of DAYLIGHT_SAVINGS.COM shows answers that cause
the procedure to queue a batch job, DST_CHANGE, which will execute when the
time changes from standard time to daylight saving time. Many of the questions
are similar to those explained in Section 6.3.2.
In the example, the initial TDF value is -5:00. The local date and time are any
time from the date in 2000 when the change to standard time was made, until
1-APR-2001:02:00, when the change to daylight saving time will be made.
$ SYS$EXAMPLES:DAYLIGHT_SAVINGS
This procedure queues a batch job that changes the system time
and system time differential around a daylight saving time
change. Press the question mark (?) key at any time for help;
hit Control-C to exit.
The Time Differential Factor (TDF) is the difference
between your system time and Coordinated Universal Time (UTC).
The difference is expressed in hh:mm format. The Americas
have negative offsets from UTC, while Europe, Africa, Asia
and Australia have positive offsets from UTC.
* Enter the Time Differential Factor: -4:00
Return
If this is a seasonal time change, it may also be
necessary to modify the system time. Generally,
seasonal time changes result in adding 1:00 hour,
or adding -1:00 hour to the local time.
* Do you wish to modify the local system time [N]: Y
Return
Enter the time value you would like to add to
the local time. The value can be a positive or
a negative (-hh:mm) value.
* Enter the time value: +1:00
Return
The process to modify your time zone offset and local
time (if supplied) can occur now or in the future.
Press Return to run the job now.
* Enter the run time in the DD-MMM-YYYY:HH:MM:SS format:
01-apr-2001:02:00
Return
NEW SYSTEM TIME DIFFERENTIAL FACTOR = -4:00.
ADDING 1:00 TO THE LOCAL TIME.
JOB RUN TIME : 1-APR-2001:02:00
* Continue? [Y]: Y
Return
Job DST_CHANGE (queue SYS$BATCH, entry 2) holding until 1-APR-2001 02:00
Batch Job DST_CHANGE scheduled to run at 1-APR-2001:02:00
$
$!!The batch job DST_CHANGE will run on 1-Apr-2001 at 02:00
6–16 Setting System Time