R help - May 2009 - inconsistent results for axis.POSIXct

Some time ago, I posted a note about what I considered to be a bug in
axis.POSIXt() for R 2.8.x, relating to whether timezones in the data are
obeyed on the axes.  A link to that note, and to a quick and helpful
response, is at the following URL 

http://www.nabble.com/patch-for-axis.POSIXct-%28related-to-timezones%29-td22338700.html#a22338700

Note that R 2.9.0 has been adjusted to help with this.  However, there are
still problems.  Test code is given below:

# test code (top panel, OK; bottom panel, incorrect times on x axis) 
par(mar=c(2,2,2,1)) 
par(mfrow=c(2,1)) 
start <- as.POSIXct("2008-05-01 00:00:00", tz="UTC") 
end   <- as.POSIXct("2008-05-01 00:10:00", tz="UTC") 
plot(c(start, end), c(0, 1), ylab="") 
mtext(paste(start, "to", end), side=3) 

start <- as.POSIXct("2008-05-01 00:00:00", tz="UTC") 
end   <- as.POSIXct("2008-05-01 01:10:00", tz="UTC") 
plot(c(start, end), c(0, 1), ylab="") 
mtext(paste(start, "to", end), side=3) 
-- 
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I can reproduce it. Can you please send a bug report to R-bugs so that 
this won't get lost.

Thank you,
Uwe Ligges



Dan Kelley wrote:
> Some time ago, I posted a note about what I considered to be a bug in
> axis.POSIXt() for R 2.8.x, relating to whether timezones in the data are
> obeyed on the axes.  A link to that note, and to a quick and helpful
> response, is at the following URL 
> 
>
http://www.nabble.com/patch-for-axis.POSIXct-%28related-to-timezones%29-td22338700.html#a22338700
> 
> Note that R 2.9.0 has been adjusted to help with this.  However, there are
> still problems.  Test code is given below:
> 
> # test code (top panel, OK; bottom panel, incorrect times on x axis) 
> par(mar=c(2,2,2,1)) 
> par(mfrow=c(2,1)) 
> start <- as.POSIXct("2008-05-01 00:00:00", tz="UTC")
> end   <- as.POSIXct("2008-05-01 00:10:00", tz="UTC")
> plot(c(start, end), c(0, 1), ylab="") 
> mtext(paste(start, "to", end), side=3) 
> 
> start <- as.POSIXct("2008-05-01 00:00:00", tz="UTC")
> end   <- as.POSIXct("2008-05-01 01:10:00", tz="UTC")
> plot(c(start, end), c(0, 1), ylab="") 
> mtext(paste(start, "to", end), side=3)