Technical data

Configuring and Managing NTP
12.5 Operating with Time Zone Offsets
2. Run the command procedure
SYS$COMMON:[SYSMGR]UTC$CONFIGURE_TDF.
3. Select an option to set the time differential factor.
The procedure prompts you for the time differential factor (TDF) (the
difference between your system time and Universal Coordinated Time (UTC)).
Specify the difference in hh:mm format.
North and South America have negative offsets from UTC. Europe, Africa,
Asia, and Australia all have positive offsets. Enter the time differential
factor.
4. The procedure asks whether or not you want to modify the local system time.
Answer Yes or No.
The procedure defines the system logical name
SYS$TIMEZONE_DIFFERENTIAL to be the system time differential
factor (or time zone offset). For example, during the summer months in
Boston, the procedure defines SYS$TIMEZONE_DIFFERENTIAL as -14400
seconds.
5. If NTP is enabled, follow these additional steps:
Stop NTP by entering the following command:
$ @SYS$STARTUP:TCPIP$NTP_SHUTDOWN.COM
Restart NTP by entering the following command:
$ @SYS$STARTUP:TCPIP$NTP_STARTUP.COM
Note
NTP works with UTC only. However, the OpenVMS time reflects the local
time. Therefore, you must follow the preceding steps to account for a
change in daylight saving time (DST).
12.6 NTP Event Logging
NTP maintains a record of system clock updates in the file
SYS$SPECIFIC:[TCPIP$NTP]TCPIP$NTP_RUN.LOG. NTP reopens this log
file daily, each time creating a new version of the file (older versions are not
automatically purged). Events logged to this file may include the following
messages:
• Synchronization status that indicates synchronization occurred, was lost, was
reestablished, stratum changes, and so on.
• System time adjustments
• Time adjustment status
• Packet transmission status
To set the amount of logging information to be recorded, set the following logical
name to a value from 1 through 6, where 6 specifies the most detailed logging:
TCPIP$NTP_LOG_LEVEL n
12–10 Configuring and Managing NTP