Message-ID: <814a72360bbc4c5ab55c53da7588e0ec@SRVEXCHCM1302.precheza.cz>
Date: 2021-11-04T22:30:39Z
From: PIKAL Petr
Subject: Date
In-Reply-To: <CAJOiR6YHWa0biFAgR-e+RkbNUyKuMr+7u1Z4A-KObS+iVwRW_w@mail.gmail.com>
Hi
Not sure why the date format was changed but if I am correct R do not read dates as dates but as character vector. You need to transfer such columns to dates by asDate. The error is probably from your use two asDate commands.
Cheers
Petr
-----Original Message-----
From: R-help <r-help-bounces at r-project.org> On Behalf Of Val
Sent: Thursday, November 4, 2021 10:43 PM
To: r-help at R-project.org (r-help at r-project.org) <r-help at r-project.org>
Subject: [R] Date
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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