NAME
timezone, dst — difference between Universal (Greenwich mean) time and Local time
VALUES
Default
timezone = 420
dst = 1
A default value of
1,
indicates that the default value for the timezone tunable (420 minutes
west of Greenwich, England ) is to be interpreted as a daylight savings
time value.
Allowed values
-720 to 720.
The value for the
timezone
tunable should correspond to a defined time zone, and thus should be at least a multiple
of 15 minutes.
More commonly the value will be a multiple of 60 or 30 minutes, corresponding to an hour
or half-hour time zone.
The value of the
dst
tunable specifies if the time is with daylight savings or not.
When the value is set to
1,
then the system is using daylight savings time, and
if it is set to
0,
the system is not.
Recommended values
Any allowed value is equally recommended.
However, the chosen value should correspond to the time zone and daylight saving scheme
of the system site or to a time zone and daylight saving scheme which has meaning
for applications or users.
DESCRIPTION
The
timezone
tunable is the difference between Greenwich mean time (Universal Time)
and local time, expressed as minutes west of Greenwich, England.
The
dst
tunable indicates whether the
timezone
tunable is to be interpreted as a standard or daylight savings time value.
These tunables provide a way to convert between Grenwich Mean Time
(or Universal Time) and local time.
Although
timezone
is a tunable, it is not used to affect the behavior of the system.
Rather, it is used to
remember time zone information when the system is rebooted.
This information is returned by
gettimeofday
under HP-UX extensions.
The
timezone
tunable is independent of other methods of indicating time zones.
For example,
date
gets or sets the time in either Universal or local time by using the
TZ
environment variable.
In this case the
timezone
tunable has no effect.
In general, it is best to refer to the manpages for specific system calls
such as
localtime()
and
tzset()
to check if there is a dependency on the
timezone
tunable.
Who Is Expected to Change This Tunable?
Anyone.
Restrictions on Changing
Changes to these tunables take effect at the next reboot.
When Should the Value of This Tunable Be Changed?
These tunables may be changed to match the system's geographic time zone
or the time zone of users.
What Other Tunable Values Should Be Changed at the Same Time?
The
timezone
and
dst
tunables should always be set and interpreted as a pair of values.
WARNINGS
All HP-UX kernel tunable parameters are release specific.
This parameter may be removed or have its meaning changed in
future releases of HP-UX.
Installation of optional kernel software, from HP or other vendors,
may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or
recommended values. For information about the effects of
installation on tunable values, consult the documentation
for the kernel software being installed.
For information about optional kernel software that was
factory installed on your system, see
HP-UX Release Notes
at
http://docs.hp.com.
AUTHOR
timezone
and
dst
were developed by HP.
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