R timeDate缩短了强制时间

Question

I have dates of the format: "2/9/2016 21:16"

When I attempt to coerce them to a timeDate, I receive the result: [1] [2016-02-03]

I would prefer to not have to write my own string manipulation, but I can and already have, but there has to be a better way. I have a dataframe and I am attempting to do the following:

restData2 <- restData %>% 
  mutate(year = year(as.timeDate(Date)),
     month = month(as.timeDate(Date)),
     day = day(as.timeDate(Date)),
     timeCategory = converToTimeCategory(Date)
  )

Note, that day is not a function in timeDate either. Day of Week and Day of year exist, I need Day of Month.

The data exists in a data frame. The data is basic transaction data.

Answer 1

David, you are confused. R differentiates between internal representation and actual formated display . For all types.

And there is (once again) no need for timeDate, lubridate, or any other wrapper:

R> intxt <- c("2/9/2016 21:16", "2/11/2016 22:23")
R> parsed <- as.POSIXct(intxt, format="%d/%m/%Y %H:%M")
R> parsed
[1] "2016-09-02 21:16:00 CDT" "2016-11-02 22:23:00 CDT"
R> format(parsed, "%d %b %Y at %H:%M")
[1] "02 Sep 2016 at 21:16" "02 Nov 2016 at 22:23"
R> 

Here we parse a datetime object into the standard POSIXct , specifying a format. Which can be day-month or month-day; here I picked the former.

Given the parsed object, I first show the default display, and then a custom format string.

Lastly, if you must, you can also convert to timeDate :

R> library(timeDate)
R> as.timeDate(parsed)
GMT
[1] [2016-09-03 02:16:00] [2016-11-03 03:23:00]
R> 

Not the timezone adjustment from my local (Central) time.