Not able to reproduce the problem. str(q) # POSIXlt[1:1], format: "2014-03-09 02:00:00" is.na(q) #[1] FALSE sessionInfo() R version 3.1.0 (2014-04-10) Platform: x86_64-unknown-linux-gnu (64-bit) A.K.
On Wednesday, July 30, 2014 1:10 PM, John McKown <john.archie.mck...@gmail.com> wrote: "I'm so confused!" Why does is.na() report TRUE for a POSIXlt date & time of 2014-03-09 02:00:00 ? > q [1] "2014-03-09 02:00:00" > is.na(q) [1] TRUE > as.POSIXct(q) [1] NA > dput(q) structure(list(sec = 0, min = 0L, hour = 2, mday = 9L, mon = 2L, year = 114L, wday = 0L, yday = 67L, isdst = 0L, zone = "", gmtoff = NA_integer_), .Names = c("sec", "min", "hour", "mday", "mon", "year", "wday", "yday", "isdst", "zone", "gmtoff"), class = c("POSIXlt", "POSIXt")) > str(q) POSIXlt[1:1], format: "2014-03-09 02:00:00" > -- There is nothing more pleasant than traveling and meeting new people! Genghis Khan Maranatha! <>< John McKown ______________________________________________ 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. ______________________________________________ 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.