[R] strange behaviour of "POSIXlt" "POSIXt" object

[ikuzar]

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

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