Changing The System Time; Configuration Guidelines - HP MSR Series Configuration Manual

Changing the system time

You must synchronize your device with a trusted time source by using NTP or changing the system time
before you run it on the network. Network management depends on an accurate system time setting,
because the timestamps of system messages and logs use the system time. For NTP configuration, see
Network Management and Monitoring Configuration Guide.
In a small-sized network, you can manually set the system time of each device.

Configuration guidelines

You can change the system time by configuring the relative time, time zone, and daylight saving time. The
configuration result depends on their configuration order (see
1 represents the clock datetime command, 2 represents the clock timezone command, and 3 represents
the clock summer-time command. To verify the system time setting, use the display clock command. This
table assumes that the original system time is 2005/1/1 1:00:00.
Table 21 System time configuration results
Command
1
2
1, 2
2, 1
3
Effective system time
date-time
Original system time ±
zone-offset
zone-offset
date-time ±
date-time
The original system time
outside the daylight
saving time range:
The system time does not
change until it falls into
the daylight saving time
range.
The original system time
in the daylight saving time
range:
The system time increases
by summer-offset.
84
Table 21). In the first column of this table,
Configuration example
clock datetime 1:00
2007/1/1
clock timezone
zone-time add 1
clock datetime 2:00
2007/2/2
clock timezone
zone-time add 1
clock timezone
zone-time add 1
clock datetime 3:00
2007/3/3
clock summer-time ss
one-off 1:00
2006/1/1 1:00
2006/8/8 2
clock summer-time ss
one-off 00:30
2005/1/1 1:00
2005/8/8 2
System time
01:00:00 UTC Mon
01/01/2007
02:00:00 zone-time Sat
01/01/2005
03:00:00 zone-time Fri
02/02/2007
03:00:00 zone-time Sat
03/03/2007
01:00:00 UTC Sat
01/01/2005
03:00:00 ss Sat
01/01/2005
If the original system time
plus summer-offset is
beyond the daylight saving
time range, the original
system time does not
change. After you disable
the daylight saving setting,
the system time
automatically decreases by
summer-offset.