write.csv conversion problem

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