[R] POSIXct vs Dates

Prof Brian Ripley ripley at stats.ox.ac.uk
Thu Apr 22 18:04:08 CEST 2004

On Thu, 22 Apr 2004, Frank E Harrell Jr wrote:

> I noticed the addition of the Dates class for dates without times, in R
> 1.9.  I am making extensive use of POSIXct at present and would like to
> know whether it is worth changing to Dates.  What are a few of the
> trade-offs?

You lose the ability to handle times and timezones.

Those who do not understand timezones have no opportunity to make errors.

There is probably a little less support for Dates at present, but you can 
coerce to POSIXct if you need to.

(It's really the second point that motivated us.)

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

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