A more portable way (that function only works in some versions of R)
is
as.POSIXct(1317857320, origin="1970-01-01")
possibly with a 'tz' argument if you need to restore the timezone.
On Wed, 5 Oct 2011, jim holtman wrote:
Here is what I use:
unix2POSIXct(1317857320)
[1] "2011-10-05 19:28:40 EDT"
unix2POSIXct <- function (time) structure(time, class = c("POSIXt",
"POSIXct"))
On Wed, Oct 5, 2011 at 7:38 PM, Mike Williamson <this.is....@gmail.com> wrote:
Hi,
In short, I would like to know if there is any way to convert a numeric
into a date, similar to how strptime() can convert a string to a date time
class?
There are some functions, etc. which don't work well with dates, and
tend to force them into numerics. I understand that the number it spits
back is the number of seconds since the beginning of 1970 (see the first few
sentences of the "Details" portion of ?DateTimeClasses).
However, it's a bit of a hassle to convert that by hand. I can create a
function to do this, and it isn't so hard, but I found it hard to believe
such a function didn't already exist, so I wanted to ask the community.
As an example, today (Oct 5th 2011 at approximately 4:30pm, Pacific
time) is approximately 1317857320 as a numeric, but I would like to know how
to go from that number back to the "2011-10-05 16:28:39 PDT" date time class
which originally generated it.
Thanks!
Mike
---
XKCD <http://www.xkcd.com>
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--
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
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--
Brian D. Ripley, rip...@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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