[R] difftime

[Prof Brian Ripley]

In the absence of any of the information requested in the posting guide, 
all we can say is that this works for other people (e.g. on both Mac OS X 
and Fedora 8 for me).

Apart from the usual info, we would need to know your timezone.

On Tue, 9 Dec 2008, eric lee wrote:

> Hi.  I'm trying to take the difference in days between two times.  Can
> you point out what's wrong, or suggest a different function?  When I
> try the following code,  The following code works fine:
>
> a <- strptime(1911100807,format="%Y%m%d%H",tz="GMT")
> b <- strptime(1911102718,format="%Y%m%d%H",tz="GMT")
> x <- difftime(b, a, units="days")
> x
>
>
> But when I change the year, the following code returns 'NA' for the
> time between a and b.  Thanks.
>
> a <- strptime(1999100807,format="%Y%m%d%H",tz="GMT")
> b <- strptime(1999102718,format="%Y%m%d%H",tz="GMT")
> x <- difftime(b, a, units="days")
> x
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

PLEASE do.

-- 
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