What version of R are you using.  Here is the results with 2.14.1 under
Windows:

> x <- as.POSIXlt("2009-03-29 06:30:00")
>
> x
[1] "2009-03-29 06:30:00"
> class(x)
[1] "POSIXlt" "POSIXt"
> is.na(x)
[1] FALSE
>


On Fri, Feb 24, 2012 at 12:57 PM, ikuzar <razuki@hotmail.fr> wrote:

> Hi,
> Does anybody know why get I this kind of strange situation:
>
> Browse[2]> hcEnd
> [1] "2009-03-29 06:30:00"
> Browse[2]> class(hcEnd)
> [1] "POSIXlt" "POSIXt"
> Browse[2]> is.na(hcEnd)
> [1] TRUE
>
> This issue is the source of my all issues in my program,
>
> Thanks for your help
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/strange-behaviour-of-POSIXlt-POSIXt-object-tp4418115p4418115.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.

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