[R] POSIXlt vs POSIXct

[Duncan Murdoch]

On 28/03/2012 10:06 AM, Steven R Corsi wrote:
> Hello R users
>
> I am searching for a descriptive summary of the use of POSIXlt as
> compared to POSIXct date/time formats. I have been using them
> extensively for different purposes, but still can't quite understand
> when to use which one for the most efficient coding and use. I typically
> use them in graphics, comparison of times, interpolation of values
> between times, computation of time-series parameters, and so on.
>
> My request is simply to learn if there is a resource out there that
> explains the strengths of the use of each format in different situations
> and if certain situations require one over the other. My web searches
> have turned up basic things like the vector form (POSIXlt) vs the
> decimal form (POSIXct), but I could not find specific guidance to
> understand when it is best to use one over the other.

The first of the "Other Topics" among the "Technical Papers" available 
from the main HTML help page in R should address this.

Duncan Murdoch