Truncating dates (and other date-time manipulations)

The problem is trying to force everything into Date class.  If you really
want a monthly series you probably want yearmon rather than Date
class

Could you give a bit more detail about why you think this is the best
way to proceed?  To me, it seems like it's easiest to have one date
class which you use regardless of the underlying accuracy of the
series (obviously in a date class the lowest level of discrimination
will be a single day).

Hadley

http://had.co.nz/