[R] Convert numeric value to POSIXct
ripley at stats.ox.ac.uk
Thu Jan 23 00:23:06 CET 2003
You can't safely. Why do you want to do this?
If there is a good reason,
structure(ddd, class=c("POSIXt", "POSIXct"))
will work currently, with no guarantees for the future.
On Wed, 22 Jan 2003, Matt Pocernich wrote:
> How do I convert a numeric value indicating the time since 1970, back into
> a POSIXct class object? I have tried format.POSIXct and as.POSIXct
> without success.
> For example
> > ccc
>  "1945-01-01 15:00:00 MDT"
> > ddd<- as.numeric(ccc);
> > ddd
>  -788842800
> > format.POSIXct(ddd)
> Error in format.POSIXct(ddd) : wrong class
> > as.POSIXct(ddd)
> Error in as.POSIXct.default(ddd) : Don't know how to convert `ddd' to
> class "POSIXct"
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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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