Ben, Thanks! That really helped. Turns out all the data being used was in EST and currently the system timezone is EDT. Thanks for the tip!
A On Tue, Oct 25, 2011 at 2:27 PM, Ben Bolker <bbol...@gmail.com> wrote: > Adrienne Wootten <amwootte <at> ncsu.edu> writes: > >> >> R-listers, >> >> I have noticed several posts on issues with difftime producing NA's >> but they have been for older versions of R. Here's the issue >> associated with difftime that I am dealing with in R 2.12.2. >> >> >> > difftime(strptime("03/11/2007 02:00",format="%m/%d/%Y > %H:%M"),preciptime,units="hours") >> Time difference of NA hours >> > > I haven't checked, but I strongly suspect that this time > falls during the "leap forward" daylight-savings-time switch > in your current time zone, so that time doesn't actually exist > in your time zone ... > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Adrienne Wootten Graduate Research Assistant State Climate Office of North Carolina Department of Marine, Earth and Atmospheric Sciences North Carolina State University ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.