[R] Date

[Jeff Newmiller]

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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-- 
Sent from my phone. Please excuse my brevity.