[R] Timezones

[ripley@stats.ox.ac.uk]

zdump manipulates its environment directly but is otherwise the same code.
Solaris and glibc define putenv slightly differently.  There are
two lines like

        char buff[20];

in src/main/datetime.c, and if you change those to 

	static char buff[200];

it should work (increasing the length as Linux timezones can be long).
(Does for me on RH7.2.)


On Thu, 6 Mar 2003 ripley at stats.ox.ac.uk wrote:

> It's a Linux issue.  Solaris gives:
> 
> > Sys.time()
> [1] "2003-03-06 08:27:23 GMT"
> > as.POSIXlt(Sys.time(), "HST")
> [1] "2003-03-05 22:27:40 HST"
> 
> which looks right to me.  Past experience suggests that Solaris's POSIX
> conformance is much better than glibc's.  Since my RH7.2 box does it too,
> I will look for a workaround.  (The problem seems to be in the use of
> tzset, and the code of zdump may indicate how to get around this.)
> 
> Brian
> 
> On Thu, 6 Mar 2003, Adrian Trapletti wrote:
> 
> > Can anybody give me a hint why as.POSIXlt doesn't recognize the same
> > timezones that zdump knows about (Linux Suse 8.1 and Suse 7.3)? Is there
> > a workaround?
> > 
> > R : Copyright 2002, The R Development Core Team
> > Version 1.6.1  (2002-11-01)
> > 
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> > [Previously saved workspace restored]
> > 
> > > Sys.time()
> > [1] "2003-03-06 08:20:09 CET"
> > > system("zdump CET")
> > CET  Thu Mar  6 08:20:14 2003 CET
> > > as.POSIXlt(Sys.time(), "HST")
> > [1] "2003-03-06 08:20:18 CET"
> > > system("zdump HST")
> > HST  Wed Mar  5 21:20:20 2003 HST
> > 
> > best
> > Adrian
> > 
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> > 
> 
> 

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
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