E.5 Brazilian DST Rule
Daylight saving time starts at 00:00 local time on the third Sunday in October
and ends at 00:00 local time on the third Sunday in February.
Selected by using
DST_RULE = BRAZIL
in the configuration file.
Brazilian DST rule provides an exception should DST end during Carnival,
stating that “details will be decided in time”. For this type of exception, use a
custom DST rule, see section
for details.
E.6 User-Defined DST Rule
To use a custom DST rule, place the following in the configuration file:
DST_RULE = CUSTOM
Additionally, values for DST_BEGIN and DST_END also have to be defined.
These values can be specified using
relative
dates (“3rd Sunday in October”)
or
fixed
dates (“the 3rd of March”).
For the specific syntax, see the folowing sections.
E.6.1 Begin / End using relative dates
Use a value in the form
M
m
.
w
.
d
/
hh
:
mm
to specify day
d
of week
w
of month
m
. Day
d
must be between 0 (Sunday)
and 6 (Saturday). Week
w
must be between 1 and 5; week 1 is the first week in
which day
d
occurs, and week 5 specifies the last
d
day in the month. The
month
m
should be between 1 (January) and 12 (December). Time
hh
:
mm
should be specified as local time.
DST should begin at 02:00 on the second Sunday in March and end at 02:00
Example:
on the last Friday in October:
DST_RULE
= CUSTOM
DST_BEGIN = M3.2.0/02:00
; second Sunday in March
DST_END
= M10.5.5/02:00 ; last Friday in October
E.6.2 Begin / End on fixed dates
Use a value in the form
J
nnn
/
hh
:
mm
to specify the ordinal day-of-year (also referred to as
Julian day
) and the
local time at which the change to/from DST should occur.
nnn
should be in the range 001 to 365. February 29 is never counted, even in
leap years.
DST should begin at 02:00 on the 1st of March and end at 00:30 on the 30th of
Example:
October:
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