How to convert a string factor into Date?

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I'm working with the London crime dataset which contains dates in an integer format. I melted them and now they have become factors.

For example, "X200801". I want to convert it into "1/1/2008".

I know as.Date is used to convert different types into date format but still, I am a bit confused with this format of date which is provided in data set i.e "X200801".

This is my structure

One possibility is to use lubridate

ss <- factor("X200801")

library(lubridate)
ymd(paste(sub("X", "", ss), "01", sep = ""))
#[1] "2008-01-01"

How to convert a string factor into Date?, One possibility is to use lubridate ss <- factor("X200801") library(lubridate) ymd( paste(sub("X", "", ss), "01", sep = "")) #[1] "2008-01-01". The Parse and TryParse methods convert many common representations of a date and time. The ParseExact and TryParseExact methods convert a string representation that conforms to the pattern specified by a date and time format string. (See the articles on standard date and time format strings and custom date and time format strings for details.)

Using base R we can add the date component using paste0 convert to date object using appropriate format.

as.Date(paste0("X200801", "01"), format = "X%Y%m%d")
#[1] "2008-01-01"

Converting factor to Date format, getting stream of NAs?, Resulting output should be in YMD and Date format. You can use #checking class of dates class(x$dates). [1] “factor” #converting as dataframe x$dates use data.frame(x, stringsAsFactors =FALSE) and now you can use as.Date(). Alain. Converting a character string into a date in R. (instead of being Factor, The chr or string of characters are then easily converted into a date:

Using anytime:

test=as.factor("X200801")
library(anytime)
anydate((gsub("X","",test)))
[1] "2008-01-01"

As suggested by @akrun we can simply supply a format that will be used within our environment with addFormats and use anydate to convert to date:

addFormats("X%Y%m")
anydate("X200801")

as.Date: Date Conversion Functions to and from Character, Functions to convert between character representations and objects of class " Date" Date methods accept character strings, factors, logical NA and objects of Date(), "%a %b %d") ## read in date info in format 'ddmmmyyyy' ## This will give� To convert a string that is already in a date format (YYYY-MM-DD) into a date object use as.Date (): x <- c("2015-07-01", "2015-08-01", "2015-09-01") as.Date(x) ## "2015-07-01" "2015-08-01" "2015-09-01" Note that the default date format is YYYY-MM-DD; therefore, if your string is of different format you must incorporate the format argument.

It can be compactly changed with as.yearmon

library(zoo)
as.Date(as.yearmon("X200801", "X%Y%m"))
#[1] "2008-01-01"

Easily Converting Strings to Times and Dates in R with flipTime , It provides functions anytime() and anydate() for date conversion. The package supports converting other R classes such as integer and factor to dates in addition� 5th example is exactly what I was looking for. But it does not cover the need “How to convert date of any format with timezone info into Instant”. Example only converts strings in the format DateTimeFormatter.ISO_INSTANT. How should I convert date string from http header to java.util.Date? I am using DateTimeFormatter.RFC_1123_DATE_TIME.

You can use parse_datetime from the readr package: testdate <- factor("X200801") parse_datetime(as.character(testdate), format = 'X%Y%M')

I wouldn't recommend using MM/DD/YYY in R. Keeping things in the ISO 8601 format is preferable.

Unable to change the format from Factor to Date in R, Unable to change the format from Factor to Date in R You can also set the parameter stringsAsFactors = FALSE if you are using read.csv() . How do you convert a string such as 2009-05-08 14:40:52,531 into a DateTime?

Time Series 02: Dealing With Dates & Times in R, Date() function will convert the characters that it recognizes to be part of a date into a date class and ignore all other characters in the string. You can use the as.Date () function to convert the string to date in R Programming. as.Date("2019-01-20") You can increment the date to check whether it is converted to date format or not using. as.Date("2019-01-20")+1 Output: "2019-01-21"

Dealing with Dates � UC Business Analytics R Programming Guide, Convert Strings to Dates. To convert a string that is already in a date format ( YYYY-MM-DD) into a date object use as.Date()� Parse() and ParseExact() are quite similar. However, in ParseExact() we can pass format as extra parameter which is not available in Parse(). Format parameter helps to convert a string date value to DateTime object when a date is different format like “11-23-2015”(Format should be “MM-dd-yyyy”).

Converting Strings to Dates � UC Business Analytics R Programming , Convert Strings to Dates. To convert a string that is already in a date format ( YYYY-MM-DD) into a date object use as.Date()� Dear R users, I have an elementary query. I have a dataset which is taken from text file with the help of read.csv command but when I generate the data in R file it converts the Dates into factor.So for the above problem, I use as.Date to convert the Dates from factor form to date format using the following: z has Date as a column.

Comments
  • Just remove the X with any replacing function eg gsub and proceed. Alternatively, find out what the source of this X is.
  • I tried using lubridate, The following object is masked from package:base : base
  • I assume the warning refers to date (not base) being masked by lubridate. That's just a notice that function date is now from lubridate (instead of base R).
  • Thanks for the correction.(Vote limit reached). @akrun