Message-ID: <alpine.LFD.1.00.0803142102480.24347@gannet.stats.ox.ac.uk>
Date: 2008-03-14T21:05:57Z
From: Brian Ripley
Subject: Addition of numeric data to dates
In-Reply-To: <da79af330803141320n78892df6h83a249d144c13fb0@mail.gmail.com>
On Fri, 14 Mar 2008, Henrique Dallazuanna wrote:
> If I understand:
>
> as.Date("2008-03-14") + 5*365
What about leap years? That is 2013-03-13.
> x <- as.Date("2008-03-14")
> xx <- as.POSIXlt(x)
> xx$year <- xx$year+5
> as.Date(xx)
[1] "2013-03-14"
is I think what is being asked for.
> On 14/03/2008, Jillywadd <jill.waddingham07 at imperial.ac.uk> wrote:
>>
>> I currently have a table of data with a column of start dates and a column
>> with some numbers representing years. I need to add these numbers to the
>> dates to get an end date. The two types of data are obviously incompatible
>> and adddition of the two will not work. Does anyone know how I might go
>> about this?? %-|
--
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