[R] Comparing two date columns

[Newbie19_02]

Hi everyone,

I have another fairly simple question.  I want to take the earliest of two
dates from these two date columns.  I've tried converting the dates to
numbers and just get a vector full of NA's.  I've also tried using the chron
function to compare the two and have been unsuccessful.  I then tried to
use:temp.2 <- as.POSIXct(strptime(temp, '%d/%m/%Y')) where temp is character
vector of one of the date columns this did not work either.  I'm not sure
what to do now.  
 
date_1             date_2
2005-11-25       <NA>
2007-10-23       <NA>
<NA>               1999-12-13
2006-01-25       <NA>
2006-06-12       <NA>
2005-08-08       <NA>
2007-12-12       <NA>
2008-04-29       <NA>
2005-03-28       <NA>
2004-11-18 2000-11-02
2006-03-16       <NA>
2007-01-17       <NA>


Thanks for your help,
Natalie
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