[R-sig-Geo] writeOGR() to shapefile and dates/times classes

[Agustin Lobo]

writeOGR() issues an error if the Spatial Points/Polygon Dataframe
has any variables of classes dates or times. While I understand that
this is rather a problem of using a bad format (shapefile) that does not accept
these kind of variables, I suggest
the developer could consider that the necessary conversion to character
were done automatically by writeOGR() and just issue a warning message
instead of an error.

Thanks!

Agus