Tunable Kernel Parameters
NAME [Toc] [Back]
timezone, dst - difference between Universal (Greenwich mean) time and
VALUES [Toc] [Back]
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 [Toc] [Back]
-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 [Toc] [Back]
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 [Toc] [Back]
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
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.
Hewlett-Packard Company - 1 - HP-UX 11i Version 2: Sep 2004
Tunable Kernel Parameters
Who Is Expected to Change This Tunable?
Restrictions on Changing [Toc] [Back]
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 [Toc] [Back]
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
AUTHOR [Toc] [Back]
timezone and dst were developed by HP.
Hewlett-Packard Company - 2 - HP-UX 11i Version 2: Sep 2004 [ Back ]