[R] Problems with as.POSIXct

KENNETH R CABRERA krcabrer at une.net.co
Thu Sep 22 17:58:37 CEST 2011

Hi R users:

This is a very strange problem:

Why this instruction shows me NA?, 
and any other date shows me that error!


This is my R version on windows 7.
"R version 2.13.1 Patched (2011-08-25 r56794)"

Thank you for your help.

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