[R] inconsistent results for axis.POSIXct

[Dan Kelley]

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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