timezone(5) File Formats Manual timezone(5) NAME timezone, dst - difference between Universal (Greenwich mean) time and Local time VALUES Default A default value of 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 The value for the 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 tunable specifies if the time is with daylight savings or not. When the value is set to then the system is using daylight savings time, and if it is set to 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 tunable is the difference between Greenwich mean time (Universal Time) and local time, expressed as minutes west of Greenwich, England. The tunable indicates whether the 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 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 infor- mation is returned by under HP-UX extensions. The tunable is independent of other methods of indicating time zones. For example, gets or sets the time in either Universal or local time by using the environment variable. In this case the tunable has no effect. In general, it is best to refer to the manpages for specific system calls such as and to check if there is a dependency on the 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 and 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 tun- able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see at AUTHOR and were developed by HP. Tunable Kernel Parameters timezone(5)