To manually copy the hardware clock (calendar) settings into the software clock, use the clock read-calendar command in EXEC modeAdmin EXEC mode.

Syntax Description

This command has no keywords or arguments.

Command Default

Read calendar is disabled.

Command Modes

EXEC mode

Admin EXEC mode

Usage Guidelines

The calendar clock is a hardware system clock that runs continuously, even if the router is powered off or rebooted. The hardware system clock is separate from the software clock settings, which are erased when the router is power cycled or rebooted.

Use the clock read-calendar command to manually copy the hardware clock setting into the software clock.

To change the software clock settings, use the clock set command in EXEC mode Admin EXEC mode.

Command Default

Clock is not set.

Command Modes

EXEC mode

Admin EXEC mode

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Generally, if the system is synchronized by a valid outside timing mechanism, such as a Network Time Protocol (NTP) clock source, or if you have a networking device with calendar capability, you need not set the software clock. Use the clock set command if no other time sources are available. The time specified in this command is relative to the configured time zone.

Setting the Software Clock

This example shows how to set the software clock using the clock set command with the day month arguments first.

RP/0/RP0/CPU0:router# clock set 14:12:00 10 feb 2005
  
14:12:00.114 JST Fri Feb 10 2009
  

This example shows how to set the software clock using the clock set command with the month day arguments first.

RP/0/RP0/CPU0:router# clock set 14:38:00 feb 10 2005
  
14:38:00.069 PST Tue Feb 10 2009
  

To configure the system to switch automatically to summer time (daylight saving time), use the clock summer-time command in global configuration mode. To remove the daylight saving time setting, use the no form of this command.

Command Default

Summer time is not configured.

offset: 60

Command Modes

Global configuration

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Use the clock summer-time command if you want the system to switch automatically to summer time (for display only):

• Use the recurring keyword to apply the rules on the configured day each year. If clock summer-time zone recurring is specified without parameters, the summer time rules default to United States standards. The default for the offset argument is 60 minutes.

• Use the date keyword to specify a start and end date for summer time if you cannot use the first form.

In both forms of the command, the first part of the command specifies when summer time begins and the second part specifies when it ends. All times are relative to the local time zone. The start time is relative to standard time. The end time is relative to summer time. If the starting month is after the ending month, the system assumes that you are in the Southern Hemisphere.

To set the time zone for display, use the clock timezone command in Admin Configuration mode or Global Configuration mode. To remove the time zone setting, use the no form of this command.

Command Default

UTC

Command Modes

Usage Guidelines

Use the clock timezone command to display the time zone only when setting the time manually. The system keeps time internally in UTC.

To copy the software clock settings to the hardware clock (calendar), use the clock update-calendar command in EXEC mode Admin EXEC mode.

Syntax Description

This command has no keywords or arguments.

Command Default

No default behavior or values

Command Modes

EXEC mode

Admin EXEC mode

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

The hardware clock (calendar) runs continuously, even if the router is powered off or rebooted. If the software clock and calendar are not synchronized and the software clock is more accurate, use this command to update the hardware calendar clock to the correct date and time.

Command Default

No default behavior or values

Command Modes

Global configuration

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Note	This command is not fully supported at this time.

To display a complete listing of the available country codes, use the online help ( ? ) function:

RP/0/RP0/CPU0:router(config)# locale country ?
  
    AD    Andorra
    AE    United Arab Emirates
    AF    Afghanistan
    AG    Antigua and Barbuda
    AI    Anguilla
    AL    Albania
    AM    Armenia
    AN    Netherlands Antilles
    AO    Angola
    AQ    Antarctica
    AR    Argentina
    AS    American Samoa
    AT    Austria
    AU    Australia
    AW    Aruba
    AZ    Azerbaijan
    BA    Bosnia and Herzegovina
    BB    Barbados
    BD    Bangladesh
    BE    Belgium
  --More-- 
  

Command Default

No default behavior or values

Command Modes

Global configuration

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Note	This command is not fully supported at this time.

To display a complete listing of the available language codes, use the online help (?) function:

RP/0/RP0/CPU0:router(config)# locale language ?
  
aa    Afar
ab    Abkhazian
af    Afrikaans
am    Amharic
ar    Arabic
as    Assamese
ay    Aymara
  --More-- 
  

To display the system clock, use the show clock command in EXEC mode.

Command Default

No default behavior or values

Command Modes

EXEC

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

The system clock keeps an “authoritative” flag that indicates whether the time is authoritative (believed to be accurate). If the system clock has been set by a timing source, such as system calendar or Network Time Protocol (NTP), the flag is set. If the time is not authoritative, it is used only for display. Until the clock is authoritative and the “authoritative” flag is set, the flag prevents peers from synchronizing to the clock when the peers have invalid times.