Enrico seems to have found the problem - you can't change dates much by changing the time zone, but transposing month and day will do the trick nicely. The mm/dd/yyyy format and others like it are so common that you always have to be on the lookout for it. Is the sample data you included in your first email taken from the file you are reading in? When I read in that sample data the correct result was returned. I would open the original file in a text editor, read the data in using your commands and then:
head(dta) and compare what appears with the original file. You may see the problem straightaway. Jim On Thu, Jan 9, 2020 at 7:50 AM Enrico Schumann <e...@enricoschumann.net> wrote: > ... > The data that you read in has January (1) as month. > So whatever goes wrong, seems to go wrong when you read > the data. Are you quite sure you read the file you > read is the file you have shown? > ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.