Technical data

Setting System Time
6.1 Setting Correct Time Zone Information on Your System
Some time zones do not have full-hour TDFs. In these cases, find the specific
value on the map itself. For example, if you live in Adelaide, Australia, your TDF
is +9:30.
In a time zone with daylight saving time, the TDF for daylight saving time is
typically +1:00 from the standard time. For example, if the standard time TDF is
+2:00, the daylight saving time TDF is +3:00; if the standard time TDF is -7:00,
the daylight saving time TDF is -6:00.
Note
Time zone rules are under control of each country and are subject to
change for political and other reasons. Printed maps are almost inevitably
out-of-date. For up-to-date information, see the following web location:
http://aa.usno.navy.mil/AA/faq/docs/world_tzones.html
6.1.2.5 Time Zone Rules
A time zone rule is used to define the short name (usually three letters) for the
time zone, the daylight saving time and standard time TDFs, and the rule for
determining when changes are made between daylight saving time and standard
time. The format of the time zone rules are defined in the DEC C Run-Time
Library Reference Manual for OpenVMS Systems.
6.1.2.6 Setting Time Zone Information
How you set the time zone information on your system depends on the following:
• Whether DTSS is in use
• The version of OpenVMS
• The architecture (VAX, Alpha, or OpenVMS Cluster)
Note
If you are using the Distributed Time Synchronization Service (DTSS),
use the procedures supplied with DTSS to set time zone information. See
Section 6.1.1.
If DTSS is not in use, use the following table to determine how to set time zone
information
Setting System Time 6–3