Configures the Greenwich Mean Time (GMT) offset and Daylight Saving Time (DST) preference.
| 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. |
Autodst, beginning every second Sunday in March, and ending every first Sunday in November.
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.
To disable automatic DST changes, re-specify the GMT offset using the noautodst option: configure timezone gmt_offst noautodst.
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 |
For name creation guidelines and a list of reserved names, see Object Names in the ExtremeXOS 22.6 User Guide.
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:
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
This command was first available in ExtremeXOS 10.1.
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