[R-SIG-Finance] write.csv conversion problem

[Martin Maechler]

>>>>> Roger J Bos <roger.bos at gmail.com>
>>>>>     on Thu, 10 Mar 2016 05:50:04 -0500 writes:

    > Peter,

    > Dates are always stored as integers, so that is expected. 

but what you say, Roger, is not correct.  They *are* integer
valued, but they are double --- so that they will not suffer
from integer overflow for dates in the distant past or future:

> str(unclass(print(as.Date(Sys.Date()))))
[1] "2016-03-10"
 num 16870
 ^^^

Martin Maechler, ETH Zurich

    > You would need to use as.character() to convert
    > the date before you output it to the file, but then it
    > won't be of type double.
    

    > Also, thee is a general r-help list where these types of questions should go. 

    > Thanks,,

    > Roger

    > On March 10, 2016, at 5:44 AM, Peter Neumaier <peter.neumaier at gmail.com> wrote:

    > Hi all,

    > I am writing a matrix (typeof = double) into a CSV file with write.csv.

    > My first column of the matrix is a date in the form yyyy-mm-dd hh:mm:ss:

    >> a_fetchdata[1,0]

    > 2016-02-09 07:30:00
    >> typeof(a_fetchdata[1,0])
    > [1] "double"


    > My CSV file contains a sequence of integers (from 1 to x) instead of the
    > expected date.

    > How can I prevent that conversion to happen when writing into CSV?

    > Thanks
    > Peter

    > [[alternative HTML version deleted]]

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