On Thu, 15 May 2008, Tom La Bone wrote:
I would like all three of these calculations to give an answer in days (or at
least the same units):
as.POSIXct("1971-08-01 00:00:00") - as.POSIXct("1971-08-01 00:00:00")
Time difference of 0 secs
as.POSIXct("1971-08-01 12:00:00") - as.POSIXct("1971-08-01 00:00:00")
Time difference of 12 hours
as.POSIXct("1971-09-01 00:00:00") - as.POSIXct("1971-08-01 00:00:00")
Time difference of 31 days
What is the best way to do this?
Use difftime() explicitly.
--
Brian D. Ripley, [EMAIL PROTECTED]
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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