Installation guide

The dst variable is not specified, daylight savings
time time does not apply. You can specify any
uppercase and lowercase letters. A leading colon (:),
comma (,), hyphen (-), plus sign(+), and ASCII NUL
are not allowed.
offset
Specifies the value to be added to the local time to
arrive at GMT. The
offset variable uses 24-hour
time and has the following syntax:
hh
[:mm [:ss ]]
If you do not specify the offset variable after the
dst variable, daylight savings time is assumed to
be 1 hour ahead of standard time. You can specify a
minus sign (
−) before the
offset variable to
indicate that the time zone is east of the prime
meridian; west is the default, which you can specify
with a plus sign (+).
start and end Specifies when daylight savings time starts and
ends. The
start and end variable has the following
syntaxes:
J j
n
M m.w.d
In the first syntax, the j variable specifies the
Julian day, which is between 1 and 365. The extra
day in a leap year (February 29) is not counted.
In the second syntax, the
n variable specifies the
zero-based Julian day, which is between zero (0)
and 365. The extra day in a leap year is counted.
In the third syntax, the
m variable specifies the
month number (from 1 to 12), the
w variable
specifies the week number (from 1 to 5), and the
d
variable specifies the day of the week (from 0 to 6),
where zero (0) specifies Sunday and six (6) specifies
Saturday.
time
Specifies the time, in local time, when the change
occurs to or from daylight savings time. The
time
variable uses 24-hour time and has the following
Customizing the System Environment 4–21