On Wed, 8 Mar 2006, Don MacQueen wrote: > I would have suggested "US/Central", by analogy with "US/Pacific" > which I use on my unix-like Mac OS X 10.3.9 system. I don't know what > might be "common knowledge" in UNIX circles, but here's a bit of > information from my system. > > It has a directory named /usr/share/zoneinfo. > > zoneinfo[166]% pwd > /usr/share/zoneinfo > > zoneinfo[167]% ls | grep DT > CST6CDT > EST5EDT > MST7MDT > PST8PDT > > There are files named GMT, UTC, GB, and a number of others. > > There are numerous subdirectories, including for example, "Asia", > "Australia", "Europe", "US". > > zoneinfo[168]% cd US > US[169]% ls > ./ Aleutian East-Indiana Indiana-Starke Pacific > ../ Arizona Eastern Michigan Pacific-New > Alaska Central Hawaii Mountain Samoa > > This suggests to me that valid values for the tz argument are > relative paths to files /usr/share/zoneinfo, but I don't know that > for a fact.
That is documented as _one_ of the allowed forms on MacOS X, and 'man tzset' will show you others (I looked at online version for your OS). Strictly, that form should be preceded by a colon, that is ':US/Central'. But the information is only in 'man tzset' on some systems. According to http://www.twinsun.com/tz/tz-link.htm this is the case on most Unix-alikes, although the base path differs considerably. However, :US/Central is not valid on Windows, and in fact as far as I know Windows only allows you to set (via TZ) timezones with no DST or the US rules for DST. The Control Panel knows some other sets of rules. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html