From ripley@stats.ox.ac.uk  Wed May  1 18:32:31 2002
From: ripley@stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Wed, 1 May 2002 18:32:31 +0100 (BST)
Subject: [Rd] converting #sec to POSIX* format
In-Reply-To: <x24rhrn71j.fsf@blueberry.kubism.ku.dk>
Message-ID: <Pine.LNX.4.31.0205011830210.31101-100000@gannet.stats>

On 1 May 2002, Peter Dalgaard BSA wrote:

> lsjensen <lsjensen@micron.com> writes:
>
> > Sure I'm missing something simple here, but I haven't been able to find a
> > easy way to convert a pure numeric (# of seconds since the beginning of
> > 1970) back into a POSIX* object.
> >
> > ex.
> > > z<-as.POSIXct(Sys.time())

It's POSIXct already.

> > > z
> > [1] "2002-05-01 10:33:56 Mountain Daylight Time"
> > > x<-unclass(z)
> > > x
> > [1] 1020270836
> >
> > Is there a simple way to transform x back into a POSIX* object similar to z?
>
> > 1020270836 + ISOdate(1970,1,1,0,0)
> [1] "2002-05-01 18:33:56 CEST"

Or, as you did unclass(), reverse that by classing it:

class(x) <- c("POSIXt", "POSIXct")

-- 
Brian D. Ripley,                  ripley@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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[Rd] converting #sec to POSIX* format
ripley@stats.ox.ac.uk