Cisco 7940-7960 Daylight Savings

US EST
When we change our clocks

Beginning in 2007, most of the United States begins Daylight Saving Time at 2:00 a.m. on the second Sunday in March and reverts to standard time on the first Sunday in November. In the U.S., each time zone switches at a different time.

time_zone: EST ; Time Zone Phone is in
dst_offset: 1 ; Offset from Phone’s time when DST is in effect
dst_start_month: Mar ; Month in which DST starts
dst_start_day: “” ; Day of month in which DST starts
dst_start_day_of_week: Sun ; Day of week in which DST starts
dst_start_week_of_month: 2 ; Week of month in which DST starts
dst_start_time: 02 ; Time of day in which DST starts
dst_stop_month: Nov ; Month in which DST stops
dst_stop_day: “” ; Day of month in which DST stops
dst_stop_day_of_week: Sunday ; Day of week in which DST stops
dst_stop_week_of_month: 1 ; Week of month in which DST stops 8=last week of month
dst_stop_time: 2 ; Time of day in which DST stops
dst_auto_adjust: 1 ; Enable(1-Default)/Disable(0) DST automatic adjustment
time_format_24hr: 1 ; Enable(1 – 24Hr Default)/Disable(0 – 12Hr)

The next example in bold is has the old dates for US DST

7940/60 Daylight Savings configuration

dst_offset: 1	Offset from Phone’s time when DST is in effect
dst_start_month: April	Month in which DST starts
dst_start_day: “”	Day of month in which DST starts
dst_start_day_of_week: Sun	Day of week in which DST starts
dst_start_week_of_month: 1	Week of month in which DST starts
dst_start_time: 02	Time of day in which DST starts
dst_stop_month: Oct	Month in which DST stops
dst_stop_day: “”	Day of month in which DST stops
dst_stop_day_of_week: Sunday	Day of week in which DST stops
dst_stop_week_of_month: 8	Week of month in which DST stops 8=last week of month
dst_stop_time: 2	Time of day in which DST stops
dst_auto_adjust: 1	Enable(1-Default)/Disable(0) DST automatic adjustment
time_format_24hr: 1	Enable(1 – 24Hr Default)/Disable(0 – 12Hr)

Depending on the way your locale sets its policy for the start and end of DST it appears Cisco will allow you to set a combination of one or more of the start/end day/day_of_week/week_of_month options. For example if DST is set to start in the 1st week of november you would set dst_start_month=november and dst_start_week_of_month=1

Australia

Australia has daylight savings in VIC, ACT, NSW, SA with remaining states/territories (QLD. WA, NT) not currently participating.

Wikipedia – Time in Australia

Of the states that observe daylight saving, most begin on the last Sunday in October at 2:00 am local standard time, and end on the last Sunday in March at 3:00 am local daylight saving time. An exception to this is the island state of Tasmania, which (due to its southern latitude) begins daylight saving earlier, on the first Sunday in October at 2:00 am local standard time.

WA is scheduled for a 3 year trial of daylight savings starting in December 2003.

DST Times
State	Start	Finish
VIC, ACT, NSW, SA	29/10/2006	25/3/2007
TAS	1/10/2006	25/3/2007
WA	3/12/2006	??? (lets guess 25/3/2007 :))

The following should be suitable for VIC, ACT, NSW and SA

dst_offset: “1”
dst_start_month: “October”

dst_start_day: “1”

dst_start_day_of_week: “Sunday”
dst_start_week_of_month: “8”
dst_start_time: “02”
dst_stop_month: “March”

dst_stop_day: “3”

dst_stop_day_of_week: “Sunday”
dst_stop_week_of_month: “8”
dst_stop_time: “02”
dst_auto_adjust: “1”

UK

time_zone: GMT
dst_offset: 1
dst_start_month: Mar
dst_start_day: “”
dst_start_day_of_week: Sun
dst_start_week_of_month: 8
dst_start_time: 02
dst_stop_month: Oct
dst_stop_day: “”
dst_stop_day_of_week: Sun
dst_stop_week_of_month: 8
dst_stop_time: 02
dst_auto_adjust: 1