[R] Problems with weekday extraction from zoo objects

From: Kerpel, John <John.Kerpel_at_infores.com>
Date: Sat 24 Jun 2006 - 05:52:07 EST


Hi Folks!  

I'm struggling with dates - but enough about my personal life.....  

I have two daily time series files. In one (x) the date format is Y/m/d and the other (y) is d/m/y. I used read.zoo on both and they read into R with no problem.  

Then I use: weekdays(as.Date(x$DATE)) and get what I expect - all the days of the week in my data set.  

When I use: weekdays(as.Date(y$Date)) I get:  

Error in fromchar(x) : character string is not in a standard unambiguous format  

I've tried to set the format= in read.zoo to format="%d/%m/%Y" but this doesn't seem to solve the problem.  

What's going on here? (I'm new to these dates functions, so please be patient - I'll get the hang out of soon!)  

Best,  

John

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