[R] System neutral Daylight Savings Time response?

Gabor Grothendieck ggrothendieck at gmail.com
Tue May 11 01:21:23 CEST 2010

Perhaps you should be using the chron package.  It has no time zones
in the first place.

On Mon, May 10, 2010 at 2:26 PM, Garrett Grolemund <gg7 at rice.edu> wrote:
> I'm searching for an r command that will notify me if I create a time that
> does not exist due to Daylight Savings Time. For example, if I run the
> following command on a windows machine
>> ISOdatetime(2010,03,14,2,10,0, tz = "") # My system time is set to the
> United States Central Time Zone
> [1] NA
> R returns NA, which is the behavior I want. However, if I run the same
> command on a mac, R returns a POSIXct object and I have to examine the
> object manually to notice that I had tried to create an impossible time.
> ISOdatetime(2010,03,14,2,10,0, tz = "")
> [1] "2010-03-14 01:10:00 CST"
> Is there a method of creating time objects in R that will always return NA
> for non-existant times, no matter the operating system?
> Thank you sincerely,
> Garrett
>        [[alternative HTML version deleted]]
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