On 6/22/2011 12:09 PM, Luke Miller wrote:
For what it's worth, I cannot reproduce this problem under a nearly
identical instance of R (R 2.12.1, Win 7 Pro 64-bit). I also can't
reproduce the problem with R 2.13.0. You've got something truly weird
going on with your particular instance of R.
is.na(strptime("5/3/1992", format="%m/%d/%Y"))
[1] FALSE
is.na(strptime("5/2/1992", format="%m/%d/%Y"))
[1] FALSE
sessionInfo()
R version 2.12.1 (2010-12-16)
Platform: i386-pc-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] rj_0.5.2-1 lattice_0.19-17
loaded via a namespace (and not attached):
[1] grid_2.12.1 rJava_0.8-8 tools_2.12.1
Like Luke, I can not reproduce what you see in (an old installation of)
R 2.12.1 (and it also didn't have rj, lattice, grid, rJava, or tools
attached or loaded in any way).
My vague gut feeling is it might be a timezone/daylight savings time
related issue (though usually times have to be involved). At least,
that is a common problem with weird things happening with dates.
What do you get as output for the following?
Sys.timezone()
Sys.info()
conflicts()
dput(strptime("5/3/1992", format="%m/%d/%Y"))
dput(as.POSIXct(strptime("5/3/1992", format="%m/%d/%Y")))
dput(strptime("5/2/1992", format="%m/%d/%Y"))
dput(as.POSIXct(strptime("5/2/1992", format="%m/%d/%Y")))
On Wed, Jun 22, 2011 at 2:40 PM, Alexander Shenkin<ashen...@ufl.edu> wrote:
On 6/22/2011 1:34 PM, Sarah Goslee wrote:
On Wed, Jun 22, 2011 at 2:28 PM, David Winsemius<dwinsem...@comcast.net> wrote:
On Jun 22, 2011, at 2:03 PM, Sarah Goslee wrote:
Hi,
On Wed, Jun 22, 2011 at 11:40 AM, Alexander Shenkin<ashen...@ufl.edu>
wrote:
is.na(strptime("5/2/1992", format="%m/%d/%Y"))
[1] FALSE
is.na(strptime("5/3/1992", format="%m/%d/%Y"))
[1] TRUE
I can't reproduce your problem on R 2.13.0 on linux:
I also cannot reproduce it on a Mac with 2.13.0 beta
Which strongly suggests that you should start by upgrading your R
installation if at all possible.
I'd also recommend trying it on a default R session, with no extra
packages loaded, and no items in your workspace. It's possible that
something else is interfering.
On linux, that's achieved by typing R --vanilla at the command line.
I'm afraid I don't know how to do it for Windows, but should be
similarly straightforward.
Thanks Sarah. Still getting the problem. I should surely upgrade, but
still, not a bad idea to get to the bottom of this, or at least have it
documented as a known issue. BTW, I'm on Windows 7 Pro x64.
(running Rgui.exe --vanilla):
is.na(strptime("5/3/1992", format="%m/%d/%Y"))
[1] TRUE
is.na(strptime("5/2/1992", format="%m/%d/%Y"))
[1] FALSE
sessionInfo()
R version 2.12.1 (2010-12-16)
Platform: i386-pc-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
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Oregon Health & Science University
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