Cisco ASR 9000 Series Aggregation Services Router System Management Command Reference, Release 4.3.x
Clock Commands on the Cisco ASR 9000 Series Router
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Clock Commands on the Cisco ASR 9000 Series Router

Clock Commands on the Cisco ASR 9000 Series Router

This module describes the commands used to set and display the internal clock settings in Cisco IOS XR software.

For more information about manually setting the router clock, see Cisco ASR 9000 Series Aggregation Services Router Getting Started Guide.

For more information about configuring the router to synchronize to Network Time Protocol (NTP), see the Implementing NTP on Cisco IOS XR Software module in Cisco ASR 9000 Series Aggregation Services Router System Management Configuration Guide.

clock read-calendar

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

clock read-calendar

Command Default

Read calendar is disabled.

Command Modes

EXEC

Command History

Release

Modification

Release 3.7.2

This command was introduced.

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 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.

Task ID

Task ID

Operations

host-services

execute

Examples

In the following example, the hardware clock settings are copied to the software clock with the clock read-calendar command. The show clock command is then entered to display the new software clock settings.

RP/0/RSP0/CPU0:router# clock read-calendar
RP/0/RSP0/CPU0:router# show clock
  
14:31:57.089 PST Tue Feb 10 2008
  

Related Commands
Related Information

Command

Description

clock set

Changes the software clock settings.

clock update-calendar

Copies the software clock settings to the hardware clock (calendar).

show clock

Displays the system clock.

update-calendar

Updates the calendar periodically from NTP.

clock set

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

clock set hh:mm:ss { day month | month day } year

Syntax Description

hh:mm:ss

Current time in hours (24-hour format), minutes, and seconds. Colons are required between values.

day

Current day (by date) in the month.

month

Current month (by name).

year

Current year (no abbreviation). Enter a valid four-digit year.

Command Default

Clock is not set.

Command Modes

EXEC

Command History

Release

Modification

Release 3.7.2

This command was introduced.

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.

Task ID

Task ID

Operations

host-services

execute

Examples

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/RSP0/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/RSP0/CPU0:router# clock set 14:38:00 feb 10 2005
  
14:38:00.069 PST Tue Feb 10 2009
  

Examples

This example shows how to display the settings of the software clock:

RP/0/RSP0/CPU0:router# show clock
  
14:38:11.292 PST Tue Feb 10 2009
  

Examples

This example shows how to display the available months using the online help (?) function:

RP/0/RSP0/CPU0:router# clock set 06:10:00 12 ?
  
    january    Month of the Year
    february
    march
    april
    may
    june
    july
    august
    september
    october
    november
    december
    

Related Commands

Command

Description

clock summer-time

Configures the system to switch automatically to daylight saving time.

clock timezone

Sets the time zone for display.

show clock

Displays the system clock.

clock summer-time

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.

clock summer-time zone { date { date month year hh:mm date month year hh:mm | month date year hh:mm month date year hh:mm } | recurring week day month hh:mm week day month hh:mm } [offset]

no clock summer-time

Syntax Description

zone

Name of the time zone (for example, PDT) to be displayed when summer time is in effect. Table 1 lists common time zone acronyms used for the zone argument.

date

Indicates that summer time should start on the first specific date listed in the command and end on the second specific date in the command.

date

Date of the month.

month

Month.

year

Year (no abbreviation).

hh:mm

Time (24-hour format) in hours and minutes.

recurring

Indicates that summer time should start and end on the corresponding specified days every year.

week

Week of the month (values are 1 to 5, first or last).

day

Day of the week.

offset

(Optional) Number of minutes to add during summer time.

Command Default

Summer time is not configured.

offset: 60

Command Modes

Global configuration

Command History

Release

Modification

Release 3.7.2

This command was introduced.

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.

Task ID

Task ID

Operations

host-services

read, write

Examples

The following example specifies that summer time starts on the first Sunday in April at 02:00 and ends on the last Sunday in October at 02:00. The recurring keyword indicates that the rules apply every year.

RP/0/RSP0/CPU0:router(config)# clock summer-time PDT recurring 1 Sunday April 2:00 last Sunday October 2:00

If you live where summer time does not follow the pattern in the first example, you could set it to start on October 12, 2008 at 02:00 and end on April 26, 2009 at 02:00, with the following example. The date keyword indicates that the rules apply for the current year only.

RP/0/RSP0/CPU0:router(config)# clock summer-time PDT date 12 October 2008 2:00 26 April 2009 2:00


Related Commands

Command

Description

clock set

Changes the software clock settings.

clock timezone

Sets the time zone for display.

clock timezone

To set the time zone for display, use the clock timezone command in global configuration mode. To remove the time zone setting, use the no form of this command.

clock timezone zone hours-offset [minutes-offset]

no clock timezone

Syntax Description

zone

Name of the time zone to be displayed when standard time is in effect.

hours-offset

Hours offset from Coordinated Universal Time (UTC). Range is from –23 to +23.

minutes-offset

(Optional) Minutes offset from UTC.

Command Default

UTC

Command Modes

Global configuration

Command History

Release

Modification

Release 3.7.2

This command was introduced.

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

This table lists common time zone acronyms used for the zone argument.



Table 1  Common Time Zone Acronyms

Acronym

Time Zone Name and UTC Offset

Europe

GMT

Greenwich Mean Time, as UTC.

BST

British Summer Time, as UTC plus 1 hour.

IST

Irish Summer Time, as UTC plus 1 hour.

WET

Western Europe Time, as UTC.

WEST

Western Europe Summer Time, as UTC plus 1 hour.

CET

Central Europe Time, as UTC plus 1 hour.

CEST

Central Europe Summer Time, as UTC plus 2 hours.

EET

Eastern Europe Time, as UTC plus 2 hours.

EEST

Eastern Europe Summer Time, as UTC plus 3 hours.

MSK

Moscow Time, as UTC plus 3 hours.

MSD

Moscow Summer Time, as UTC plus 4 hours.

United States and Canada

AST

Atlantic Standard Time, as UTC minus 4 hours.

ADT

Atlantic Daylight Time, as UTC minus 3 hours.

ET

Eastern Time, either as EST or EDT, depending on place and time of year.

EST

Eastern Standard Time, as UTC minus 5 hours.

EDT

Eastern Daylight Saving Time, as UTC minus 4 hours.

CT

Central Time, either as CST or CDT, depending on place and time of year.

CST

Central Standard Time, as UTC minus 6 hours.

CDT

Central Daylight Saving Time, as UTC minus 5 hours.

MT

Mountain Time, either as MST or MDT, depending on place and time of year.

MST

Mountain Standard Time, as UTC minus 7 hours.

MDT

Mountain Daylight Saving Time, as UTC minus 6 hours.

PT

Pacific Time, either as PST or PDT, depending on place and time of year.

PST

Pacific Standard Time, as UTC minus 8 hours.

PDT

Pacific Daylight Saving Time, as UTC minus 7 hours.

AKST

Alaska Standard Time, as UTC minus 9 hours.

AKDT

Alaska Standard Daylight Saving Time, as UTC minus 8 hours.

HST

Hawaiian Standard Time, as UTC minus 10 hours.

Australia

WST

Western Standard Time, as UTC plus 8 hours.

CST

Central Standard Time, as UTC plus 9.5 hours.

EST

Eastern Standard/Summer Time, as UTC plus 10 hours (plus 11 hours during summer time).

This table lists an alternative method for referring to time zones, in which single letters are used to refer to the time zone difference from UTC. Using this method, the letter Z is used to indicate the zero meridian, equivalent to UTC, and the letter J (Juliet) is used to refer to the local time zone. Using this method, the International Date Line is between time zones M and Y.



Table 2  Single-Letter Time Zone Designators

Letter Designator

Word Designator

Difference from UTC

Y

Yankee

UTC minus 12 hours.

X

Xray

UTC minus 11 hours.

W

Whiskey

UTC minus 10 hours.

V

Victor

UTC minus 9 hours.

U

Uniform

UTC minus 8 hours.

T

Tango

UTC minus 7 hours.

S

Sierra

UTC minus 6 hours.

R

Romeo

UTC minus 5 hours.

Q

Quebec

UTC minus 4 hours.

P

Papa

UTC minus 3 hours.

O

Oscar

UTC minus 2 hours.

N

November

UTC minus 1 hour.

Z

Zulu

Same as UTC.

A

Alpha

UTC plus 1 hour.

B

Bravo

UTC plus 2 hours.

C

Charlie

UTC plus 3 hours.

D

Delta

UTC plus 4 hours.

E

Echo

UTC plus 5 hours.

F

Foxtrot

UTC plus 6 hours.

G

Golf

UTC plus 7 hours.

H

Hotel

UTC plus 8 hours.

I

India

UTC plus 9 hours.

K

Kilo

UTC plus 10 hours.

L

Lima

UTC plus 11 hours.

M

Mike

UTC plus 12 hours.

Task ID

Task ID

Operations

host-services

read, write

Examples

The following example shows how to set the time zone to PST and offset 8 hours behind UTC:

RP/0/RSP0/CPU0:router(config)# clock timezone PST -8
                      

The following example shows how to set the time zone to Newfoundland Standard Time (NST) for Newfoundland, Canada, which is 3.5 hours behind UTC:

RP/0/RSP0/CPU0:router(config)# clock timezone NST -3 30
                     

Related Commands

Command

Description

clock set

Changes the software clock settings.

clock summer-time

Configures the system to switch automatically to daylight saving time.

show clock

Displays the system clock.

clock update-calendar

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

clock update-calendar

Syntax Description

This command has no keywords or arguments.

Command Default

No default behavior or values

Command Modes

EXEC

Command History

Release

Modification

Release 3.7.2

This command was introduced.

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.

Task ID

Task ID

Operations

host-services

execute

Examples

The following example shows how to copy the current time from the software clock to the hardware clock:

RP/0/RP0/CPU0:router# clock update-calendar
                     

Related Commands

Command

Description

clock read-calendar

Manually copies the hardware clock (calendar) settings into the software clock.

locale country

To set the default country of use, use the locale country command in global configuration mode. To remove the country setting, use the no form of this command.

locale country country

no locale country

Syntax Description

country

Country, where country is a two-character country code. Case is not important.

Command Default

No default behavior or values

Command Modes

Global configuration

Command History

Release

Modification

Release 3.7.2

This command was introduced.

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/RSP0/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-- 
  

Task ID

Task ID

Operations

host-services

read, write

Examples

The following example shows how to set the country of use to Australia:

RP/0/RSP0/CPU0:router(config)# locale country au
            
         

Related Commands

Command

Description

locale language

Sets the default language of use.

locale language

To set the default language of use, use the locale language command in global configuration mode. To remove the language setting, use the no form of this command.

locale language language

no locale language

Syntax Description

language

Two-character code that specifies the language. Case is not important.

Command Default

No default behavior or values

Command Modes

Global configuration

Command History

Release

Modification

Release 3.7.2

This command was introduced.

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/RSP0/CPU0:router(config)# locale language ?
  
aa    Afar
ab    Abkhazian
af    Afrikaans
am    Amharic
ar    Arabic
as    Assamese
ay    Aymara
  --More-- 
  

Task ID

Task ID

Operations

host-services

read, write

Examples

The following example shows how to set the language of use to English:

RP/0/RSP0/CPU0:router(config)# locale language en
                    

Related Commands

Command

Description

locale country

Sets the default country of use.

show clock

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

show clock [detail]

Syntax Description

detail

(Optional) Indicates the time zone, time source, and current summer time setting (if any).

Command Default

No default behavior or values

Command Modes

EXEC

Command History

Release

Modification

Release 3.7.2

This command was introduced.

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.

The leading symbols that precede the show clock command display are shown in this table

Table 3  show clock Display Leading Symbol Descriptions

Symbol

Description

*

Time is not authoritative.

(blank)

Time is authoritative.

.

Time is authoritative, but NTP is not synchronized.

Task ID

Task ID

Operations

basic-services

read

Examples

The following sample output shows the current clock settings:

RP/0/RSP0/CPU0:router# show clock
  
16:18:28.927 PST Tue Feb 10 2009
    

The following sample output shows the current clock detail, including the time zone and time source:

RP/0/RSP0/CPU0:router# show clock detail
  
16:18:07.164 PST Tue Feb 10 2009
Timezone: PST8PST Timesource: User configured
  

Related Commands

Command

Description

clock set

Changes the software clock settings.