configure timezone
ExtremeWare Software 7.3.0 Command Reference Guide 81
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
first Sunday in April at 2:00 AM and ends the last Sunday in October at 2:00 AM, applies to most of
North America, and can be configured with the following syntax:
configure timezone <gmt_offst> autodst
.
As of ExtremeWare 6.2.1, 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 (e.g. 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
first sunday april
.
• The
ends
specification defaults to
every
last sunday october
.
• 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.
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.
Table 5 describes the GMT offsets.
Table 5: Greenwich Mean Time 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 Azores, Cape Verde Islands
-2:00 -120 AT - Azores
-3:00 -180 Brasilia, Brazil; Buenos Aires, Argentina;
Georgetown, Guyana;
-4:00 -240 AST - Atlantic Standard Caracas; La Paz
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