configure timezone

configure timezone {name tz_name} GMT_offset {autodst {name dst_timezone_ID} {dst_offset} {begins [every floatingday | on absoluteday] {at time_of_day} {ends [every floatingday | on absoluteday] {at time_of_day}}} | noautodst}

Description

Configures the Greenwich Mean Time (GMT) offset and Daylight Saving Time (DST) preference.

Syntax Description


`tz_name`	Specifies an optional name for this timezone specification. May be up to six alphabetic characters in length. The default is an empty string.
`GMT_offset`	Specifies a Greenwich Mean Time (GMT) offset, in + or - minutes.
autodst	Enables automatic Daylight Saving Time.
`dst-timezone-ID`	Specifies an optional name for this DST specification. May be up to six characters in length. The default is an empty string.
`dst_offset`	Specifies an offset from standard time, in minutes. Value is in the range of 1 to 60. Default is 60 minutes.
`floatingday`	Specifies the day, week, and month of the year to begin or end DST each year. Format is: `week` `day` `month` where: `week` is specified as [first \| second \| third \| fourth \| last] or 1-5. `day` is specified as [sunday \| monday \| tuesday \| wednesday \| thursday \| friday \| saturday] or 1-7 (where 1 is Sunday). `month` is specified as [january \| february \| march \| april \| may \| june \| july \| august \| september \| october \| november \| december] or 1-12. Default for beginning is second sunday march; default for ending is first sunday november.
`absoluteday`	Specifies a specific day of a specific year on which to begin or end DST. Format is: `month` `day` `year` where: `month` is specified as 1-12. `day` is specified as 1-31. `year` is specified as 2003-2035. The year must be the same for the begin and end dates.
`time_of_day`	Specifies the time of day to begin or end Daylight Saving Time. May be specified as an hour (0-23) or as hour:minutes. Default is 2:00.
noautodst	Disables automatic Daylight Saving Time.

Default

Autodst, beginning every second Sunday in March, and ending every first Sunday in November.

Usage Guidelines

Network Time Protocol (NTP) server updates are distributed using GMT time.

To properly display the local time in logs and other timestamp information, the switch should be configured with the appropriate offset to GMT based on geographic location.

The GMT_offset is specified in +/- minutes from the GMT time.

Automatic DST changes can be enabled or disabled. The default configuration, where DST begins on the second Sunday in March at 2:00 AM and ends the first Sunday in November at 2:00 AM, applies to most of North America (beginning in 2007), and can be configured with the following syntax: configure timezone GMT_offst autodst.

The starting and ending date and time for DST may be specified, as these vary in time zones around the world.

Use the every keyword to specify a year-after-year repeating set of dates (for example, the last Sunday in March every year).
Use the on keyword to specify a non-repeating, specific date for the specified year. If you use this option, you will need to specify the command again every year.
The begins specification defaults to every second Sunday in March.
The ends specification defaults to every first sunday november.
The ends date may occur earlier in the year than the begins date. This will be the case for countries in the Southern Hemisphere.
If you specify only the starting or ending time (not both) the one you leave unspecified will be reset to its default.
The time_of_day specification defaults to 2:00.
The timezone IDs are optional. They are used only in the display of timezone configuration information in the show switch command.

To disable automatic DST changes, re-specify the GMT offset using the noautodst option: configure timezone gmt_offst noautodst.

Greenwich Mean Time offsets

NTP updates are distributed using GMT time. To properly display the local time in logs and other timestamp information, the switch should be configured with the appropriate offset to GMT based on geographical location. configure timezone describes the GMT offsets.


GMT Offset in Hours	GMT Offset in Minutes	Common Time Zone References	Cities
+0:00	+0	GMT - Greenwich Mean UT or UTC - Universal (Coordinated) WET - Western European	London, England; Dublin, Ireland; Edinburgh, Scotland; Lisbon, Portugal; Reykjavik, Iceland; Casablanca, Morocco
-1:00	-60	WAT - West Africa	Cape Verde Islands
-2:00	-120	AT - Azores	Azores
-3:00	-180		Brasilia, Brazil; Buenos Aires, Argentina; Georgetown, Guyana;
-4:00	-240	AST - Atlantic Standard	Caracas; La Paz
-5:00	-300	EST - Eastern Standard	Bogota, Columbia; Lima, Peru; New York, NY, Trevor City, MI USA
-6:00	-360	CST - Central Standard	Mexico City, Mexico
-7:00	-420	MST - Mountain Standard	Saskatchewan, Canada
-8:00	-480	PST - Pacific Standard	Los Angeles, CA, Cupertino, CA, Seattle, WA USA
-9:00	-540	YST - Yukon Standard
-10:00	-600	AHST - Alaska-Hawaii Standard CAT - Central Alaska HST - Hawaii Standard
-11:00	-660	NT - Nome
-12:00	-720	IDLW - International Date Line West
+1:00	+60	CET - Central European FWT - French Winter MET - Middle European MEWT - Middle European Winter SWT - Swedish Winter	Paris, France; Berlin, Germany; Amsterdam, The Netherlands; Brussels, Belgium; Vienna, Austria; Madrid, Spain; Rome, Italy; Bern, Switzerland; Stockholm, Sweden; Oslo, Norway
+2:00	+120	EET - Eastern European, Russia Zone 1	Athens, Greece; Helsinki, Finland; Istanbul, Turkey; Jerusalem, Israel; Harare, Zimbabwe
+3:00	+180	BT - Baghdad, Russia Zone 2	Kuwait; Nairobi, Kenya; Riyadh, Saudi Arabia; Moscow, Russia; Tehran, Iran
+4:00	+240	ZP4 - Russia Zone 3	Abu Dhabi, UAE; Muscat; Tblisi; Volgograd; Kabul
+5:00	+300	ZP5 - Russia Zone 4
+5:30	+330	IST – India Standard Time	New Delhi, Pune, Allahabad, India
+6:00	+360	ZP6 - Russia Zone 5
+7:00	+420	WAST - West Australian Standard
+8:00	+480	CCT - China Coast, Russia Zone 7
+9:00	+540	JST - Japan Standard, Russia Zone 8
+10:00	+600	EAST - East Australian Standard GST - Guam Standard Russia Zone 9
+11:00	+660
+12:00	+720	IDLE - International Date Line East NZST - New Zealand Standard NZT - New Zealand	Wellington, New Zealand; Fiji, Marshall Islands
+13:00	+780	PHOT-Phoenix Island Time	Kanton Island
+14:00	+840	LINT-Line Islands Time	Kiritimati

For name creation guidelines and a list of reserved names, see Object Names in the Switch Engine v33.1.1 User Guide .

Example

The following example configures GMT offset for Mexico City, Mexico and disables automatic DST:

# configure timezone -360 noautodst

The following four commands are equivalent, and configure the GMT offset and automatic DST adjustment for the US Eastern timezone, with an optional timezone ID of EST:

3 configure timezone name EST -300 autodst name EDT 60 begins every second sunday march at 2 ends every first sunday november at 2:00
# configure timezone name EST -300 autodst name EDT 60 begins every 1 1 4 at 2:00 ends every 5 1 10 at 2:00
# configure timezone name EST -300 autodst name EDT
# configure timezone -300 autodst

The following example configures the GMT offset and automatic DST adjustment for the Middle European timezone, with the optional timezone ID of MET:

# configure timezone name MET 60 autodst name MDT begins every last sunday march at 1 ends every last sunday october at 1

The following command configures the GMT offset and automatic DST adjustment for New Zealand. The ending date must be configured each year because it occurs on the first Sunday on or after March 5:

# configure timezone name NZST 720 autodst name NZDT 60 begins every first sunday october at 2 ends on 3/16/2002 at 2

History

This command was first available in ExtremeXOS 10.1.

Platform Availability

This command is available on all Universal switches supported in this document.