11-4 
displayed in the ways shown in Table 11-1. The meanings of the parameters in the configuration column 
are as follows: 
z  1 indicates date-time has been configured with the clock datetime. 
z  2 indicates time-zone has been configured with the clock timezone command and the offset time 
is zone-offset. 
z  3 indicates daylight saving time has been configured with the clock summer-time command and 
the offset time is summer-offset. 
z  [1] indicates the clock datetime command is an optional configuration. 
z  The default system clock is 2005/1/1 1:00:00 in the example. 
Table 11-1 Relationship between the configuration and display of the system clock 
Configuration 
System clock displayed by 
the display clock command 
Example 
1 
date-time 
Configure: clock datetime 1:00 2007/1/1 
Display: 01:00:00 UTC Mon 01/01/2007 
2 
The original system clock ± 
zone-offset 
Configure: clock timezone zone-time add 1 
Display: 02:00:00 zone-time Sat 01/01/2005 
1 and 2  date-time ± zone-offset 
Configure: clock datetime 2:00 2007/2/2 and clock 
timezone zone-time add 1 
Display: 03:00:00 zone-time Fri 02/02/2007 
[1], 2 and 1 
date-time 
Configure: clock timezone zone-time add 1 and clock 
datetime 3:00 2007/3/3 
Display: 03:00:00 zone-time Sat 03/03/2007 
If the original system clock is not 
in the daylight saving time 
range, the original system clock 
is displayed. 
Configure: clock summer-time ss one-off 1:00 2006/1/1 
1:00 2006/8/8 2 
Display: 01:00:00 UTC Sat 01/01/2005 
3 
If the original system clock is in 
the daylight saving time range, 
the original system clock + 
summer-offset is displayed. 
Configure: clock summer-time ss one-off 00:30 2005/1/1 
1:00 2005/8/8 2 
Display: 03:00:00 ss Sat 01/01/2005 
If date-time is not in the daylight 
saving time range, date-time is 
displayed. 
Configure: clock datetime 1:00 2007/1/1 and clock 
summer-time ss one-off 1:00 2006/1/1 1:00 2006/8/8 2 
Display: 01:00:00 UTC Mon 01/01/2007 
1 and 3 
If date-time is in the daylight 
saving time range, “date-time” + 
“summer-offset” is displayed. 
Configure: clock datetime 8:00 2007/1/1 and clock 
summer-time ss one-off 1:00 2007/1/1 1:00 2007/8/8 2 
Display: 10:00:00 ss Mon 01/01/2007 
If date-time is not in the daylight 
saving time range, date-time is 
displayed. 
Configure: clock summer-time ss one-off 1:00 2007/1/1 
1:00 2007/8/8 2 and clock datetime 1:00 2008/1/1 
Display: 01:00:00 UTC Tue 01/01/2008 
Configure: clock summer-time ss one-off 1:00 2007/1/1 
1:00 2007/8/8 2 and clock datetime 1:30 2007/1/1 
Display: 23:30:00 UTC Sun 12/31/2006 
[1], 3 and 1 
date-time is in the daylight 
saving time range: 
If the value of “date-time” - 
“summer-offset” is not in the 
summer-time range, “date-time” 
- “summer-offset”  is displayed; 
If the value of “date-time” - 
“summer-offset” is in the 
summer-time range, date-time 
is displayed. 
Configure: clock summer-time ss one-off 1:00 2007/1/1 
1:00 2007/8/8 2 and clock datetime 3:00 2007/1/1 
Display: 03:00:00 ss Mon 01/01/2007