[R-SIG-Mac]Date conversion problems

Don MacQueen macq@llnl.gov
Mon, 3 Feb 2003 07:10:21 -0800

Try format="%m/%d/%Y"

The help pages are pretty good, and the examples in ?strptime show 
something quite similar to your case.

Vol. 1/2 of R News (available at the R website) has the article that 
introduced the POSIXt classes.


>I have a data set with dates stored as a factor with levels coded as, for
>example  "01/03/1996"
>I tried the following:
>onset <- strptime(as.character(cf$dx.dt), format="%m%d%Y")
>where cf$dx.dt are the dates in the data frame cf.  For output, I get NA
>for every entry.  If it matters, I'm running the fink version of R 1.6.1
>on a powerbook G4 with OS 10.2.2. 
>I have little experience dealing with dates in R.  Is there a reference
>that discusses the general issues?
>Any help would be much appreciated.
>John Carew <jcarew@stat.wisc.edu>
>Department of Statistics
>University of Wisconsin--Madison
>R-SIG-Mac mailing list

Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA