[R] Creating a Date Field

Jeff Newmiller jdnewm|| @end|ng |rom dcn@d@v|@@c@@u@
Wed Sep 25 02:06:06 CEST 2019

You are not comparing your character date data with the format string. Specifically there are no spaces in your data but there are in your format string. Any characters in the format string that are not part of % date component specifications must be found in your data.

On September 24, 2019 4:54:00 PM PDT, Phillip Heinrich <herd_dog using cox.net> wrote:
>The date is imbedded in the GameID character field so I created a date
>vector with the following code:
>ari18.test3$date <- substring(ari18.test3$GameID,4,11)  And then
>created a new dataframe with just the Game ID and date vectors.  The
>date field is a character as shown by the str() command. str(test)
>'data.frame':	3 obs. of  2 variables:
> $ GameID: Factor w/ 3 levels "ARI201803290",..: 1 2 3
>$ date  : chr  "20180329" "20180330" "20180331"           GameID    
>1   ARI201803290 20180329
>81  ARI201803300 20180330
>165 ARI201803310 20180331
>> My notes from about a week ago say that the following code will turn
>“date” into a date field: test$date <- as.Date(test$date,format="%Y %M
>%D")  date becomes a date field but the data disappears into NA  
>'data.frame':	3 obs. of  2 variables:
> $ GameID: Factor w/ 3 levels "ARI201803290",..: 1 2 3
> $ date  : Date, format: NA NA NA  What am I missing here?
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Sent from my phone. Please excuse my brevity.

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