[R] chron problem: extracting days and years

[Prof Brian Ripley]

as.POSIXlt is nothing to do with chron.  You are confusing two systems.
months() is part of base R: days() is not, and it does not say it works
with R's dates.

The answer is on the help page for months(), BTW:

> c(testdate$mday, testdate$year)
[1] 17  98

or look at ?strftime for e.g.

> format(testdate, "%Y")
[1] "1998"
> format(testdate, "%d")
[1] "17"

if you want a character string.

On Sun, 3 Feb 2002, John Field wrote:

> Hello r-help,
>
> I'm trying to split a character vector of dates of the form "dd-mmm-yy"
> into component days, months and years. But
>
>  > library(chron)
>  > testdate<-as.POSIXlt(strptime("17-Sep-98","%d-%b-%y"))
>  > testdate
> [1] "1998-09-17"
>  > months(testdate)
> [1] "September"    # which is fine, but for days and years I get
>  > days(testdate)
> NULL
>  > years(testdate)
> NULL
>  >
>
> According to "?days" these should work.  What am I doing wrong?  Is there
> an easier way to achieve what I want?
> (I'm running R1.3.0 under Win98).

An R upgrade is long overdue ....

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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