Ross SRG-4400, User Manual

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5–30 • Menu System SRG-4400 User Manual (Iss. 06)
Additional Information for the Summer/Winter DST
If the menu line Daylight Saving in the UTC DateTime menu is set to User Defined, the time and
date fields of this menu can be edited. If the menu line Daylight Saving is set to Off or Automatic,
editing is disabled.
The menus for Summer DST Event and Winter DST Event indicate the time and date for the next
change in daylight saving time. At the indicated time and date, an hour will be added to or
subtracted from SPG Time. For some countries these dates are automated. The dates of a change
to or from daylight saving time are dictated well in advance, and by using the “Country Code” in
the UTC DateTime menu, these dates are automatically implemented. As an example:
Summer Time Rule:
• Start: Last Sunday in March
• End: Last Sunday in October
• Time: 1.00 am (01:00) Greenwich Mean Time (GMT)
Equation used to calculate the beginning of European Summer Time: Sunday (31 - (5*y/4 + 4)
mod 7) March at 01.00 UTC
Equation used to calculate the end of European Summer Time: Sunday (31 - (5*y/4 + 1) mod 7)
October at 01.00 UTC
For countries where the SRG-4400 does not support automatic implementation of daylight saving
time, the dates can be entered manually in advance of each event and the automatic procedure
will occur for that one event. A more detailed description of implementing a manual update of
these event dates is given in the “Daylight Saving” menu description above.
A full list of countries for which DST is automatically supported is shown below.
Note
— In the United Kingdom, Daylight Saving Time is referred to as British Summer Time
(BST).
Table 5.8 Countries that DST is Automatically Supported
Country Start End Action Time
Australia
First Sunday in
October First Sunday in April
the following year
02:00 local standard time
(AEST=UTC+11, ACST=UTC+10.5)
Brazil
Third Sunday in
October
Third Sunday in
February the
following year
DST starts at 00:00 on the third Sunday
in October and ends at 00:00 on the
third Sunday in February - unless the
latter falls during Carnaval, in which
case, the end of DST is postponed by
one week. The next six times in which
the end of DST is scheduled to be
postponed are 2012, 2015, 2023, 2026,
2034 and 2037. It is unknown whether
this is 00:00 local time or local standard
time, so local standard time has been
chosen.
Canada
Second Sunday in
March First Sunday in
November Since 2007, all time changes take place
at 02:00 local time
New Zealand
Last Sunday in
September First Sunday in April
the following year
02:00 local standard time
(NZST=UTC+12)