[R] Date

[Val]

Jeff,

The date from y data file looks like as follow in the Linux environment,
My_date
2019-09-16
2021-02-21
2021-02-22
2017-10-11
2017-10-10
2018-11-11
2017-10-27
2017-10-30
2019-05-20

On Thu, Nov 4, 2021 at 5:00 PM Jeff Newmiller <jdnewmil using dcn.davis.ca.us> wrote:
>
> You are claiming behavior that is not something R does, but is something Excel does constantly.
>
> Compare what your data file looks like using a text editor with what R has imported. Absolutely do not use a spreadsheet program to do this.
>
> On November 4, 2021 2:43:25 PM PDT, Val <valkremk using gmail.com> wrote:
> >IHi All, l,
> >
> >I am  reading a csv file  and one of the columns is named as  "mydate"
> > with this form, 2019-09-16.
> >
> >I am reading this file as
> >
> >dat=read.csv("myfile.csv")
> >     the structure of the data looks like as follow
> >
> >str(dat)
> >mydate : chr  "09/16/2019" "02/21/2021" "02/22/2021" "10/11/2017" ...
> >
> >Please note the format  has  changed from YYYY-mm-dd  to mm/dd/YYYY
> >When I tried to change this   as a Date using
> >
> >as.Date(as.Date(mydate,     format="%m/%d/%Y" )
> >I am getting this error message
> >    Error in charToDate(x) :
> >      characte string is not in a standard unambiguous format
> >
> >My question is,
> >1. how can I read the file as it is (i.e., without changing the date format) ?
> >2. why does R change the date format?
> >
> >Thank you,
> >
> >______________________________________________
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> >and provide commented, minimal, self-contained, reproducible code.
>
> --
> Sent from my phone. Please excuse my brevity.