Use %Y (upper case) for 4 digit years On Wed, Jan 6, 2010 at 10:25 AM, Larry White <ljw1...@gmail.com> wrote:
> Hi, I'm reading data from a text file and transforming it in R and my date > column seems to be getting corrupted. Can someone point out what's wrong? > This code worked fine until I added a new date in 2010. > > thank you. > > > To load the data I run: > work_table = read.table(datafilename,header=TRUE) #read > the > data file > attach(work_table) #attach > the file for ease of use > names(work_table) = > c( "cur_date", "week", "time_pct", "compl", "work_delta", > "mean_delta", "balance", "total", "total_delta", > "work", "index", "mean_pd_per_day") > > If I list the date element cur_date, I get: > > work_table$cur_date > [1] 8/17/2009 8/30/2009 9/6/2009 9/13/2009 9/20/2009 9/27/2009 > [7] 10/4/2009 10/13/2009 10/20/2009 10/27/2009 11/3/2009 11/10/2009 > [13] 11/17/2009 11/24/2009 12/2/2009 12/9/2009 12/16/2009 12/23/2009 > [19] 12/30/2009 1/6/2010 > > This is correct. > > > The line that produces the bad output is: > dt <-strptime(as.character(work_table$cur_date), "%m/%d/%y") > > when I list dt I get: > >dt > [1] "2020-08-17" "2020-08-30" "2020-09-06" "2020-09-13" "2020-09-20" > [6] "2020-09-27" "2020-10-04" "2020-10-13" "2020-10-20" "2020-10-27" > [11] "2020-11-03" "2020-11-10" "2020-11-17" "2020-11-24" "2020-12-02" > [16] "2020-12-09" "2020-12-16" "2020-12-23" "2020-12-30" "2020-01-06" > > The inside function as.character seems to provide correct output > > > > as.character(work_table$cur_date) > [1] "8/17/2009" "8/30/2009" "9/6/2009" "9/13/2009" "9/20/2009" > [6] "9/27/2009" "10/4/2009" "10/13/2009" "10/20/2009" "10/27/2009" > [11] "11/3/2009" "11/10/2009" "11/17/2009" "11/24/2009" "12/2/2009" > [16] "12/9/2009" "12/16/2009" "12/23/2009" "12/30/2009" "1/6/2010" > > which makes me think I'm doing something wrong in my strptime() call. > as.character(bug_table$rep_date) > > Thanks very much for your help > > [[alternative HTML version deleted]] > > ______________________________________________ > 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<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? [[alternative HTML version deleted]] ______________________________________________ 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.
