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Catalyst 2928 Switch Software Configuration Guide
OL-23389-01
Chapter 7 Administering the Switch
Managing the System Time and Date
Displaying the Time and Date Configuration
To display the time and date configuration, use the
show clock
[
detail
] privileged EXEC command.
The system clock keeps an
authoritative
flag that shows whether the time is authoritative (believed to be
accurate). If the system clock has been set by a timing source such as NTP, the flag is set. If the time is
not authoritative, it is used only for display purposes. Until the clock is authoritative and the
authoritative
flag is set, the flag prevents peers from synchronizing to the clock when the peers’ time is
invalid.
The symbol that precedes the
show clock
display has this meaning:
•
*—Time is not authoritative.
•
(blank)—Time is authoritative.
•
.—Time is authoritative, but NTP is not synchronized.
Configuring the Time Zone
Beginning in privileged EXEC mode, follow these steps to manually configure the time zone:
The
minutes-offset
variable in the
clock timezone
global configuration command is available for those
cases where a local time zone is a percentage of an hour different from UTC. For example, the time zone
for some sections of Atlantic Canada (AST) is UTC-3.5, where the 3 means 3 hours and .5 means 50
percent. In this case, the necessary command is
clock timezone AST -3 30
.
To set the time to UTC, use the
no clock timezone
global configuration command.
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
clock timezone
zone
hours-offset
[
minutes-offset
]
Set the time zone.
The switch keeps internal time in universal time coordinated (UTC), so
this command is used only for display purposes and when the time is
manually set.
•
For
zone
, enter the name of the time zone to be displayed when
standard time is in effect. The default is UTC.
•
For
hours-offset
, enter the hours offset from UTC.
•
(Optional) For
minutes-offset
, enter the minutes offset from UTC.
Step 3
end
Return to privileged EXEC mode.
Step 4
show running-config
Verify your entries.
Step 5
copy running-config startup-config
(Optional) Save your entries in the configuration file.
