[R] unwanted conversion of date formats in 2.3.1 to character

[lorenzo.logi at hsbc.fr]

good morning
I'm using R 2.2.1 on windows (2000/NT/XP) and trying to upgrade to 2.3.1

I am finding the curious problem of date/time data (both if stocked as date and as POSIX) that gets converted into character format whenever touched: it seems that date/time data just does not want to remain that way.

For example, a data.frame containing dates or POSIXct as row.names that is returned as result from a function arrives to the calling function with characters as row.names:
      pippo<-function(...) {
            result<-data.frame( ... )
            attributes(result)$row.names<- ... (some dates or POSIX)
            #mode(attributes(xx)$row.names) is now numeric, = date or POSIX
            return(result)
      }

      xx <- pippo(...)
      #mode(attributes(xx)$row.names) is now character !!!!

This is new to 2.3.1 (and to 2.3.0 i suppose), i.e. everything worked like a charm in 2.2.1; it looks like a bug to me (but might notbe), and I have not been able to find any reference to such a problem in the archives (which is strange,
but I might have got blind).

Any idea pls?
Thanks a lot in advance


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