Representing ambiguity in datetime?

[Dan Christensen]

Ron Adam <rrr at ronadam.com> writes:

> So it seems using 0's for the missing day or month may be how to do it.

This doesn't allow more specific amounts of ambiguity.  I suggest
either a pair of dates, which represent the earliest and latest that
the event could have been (and are equal if there is no ambiguity),
or a date plus a number of days of uncertainty, i.e. 
21 June 2005 +- 5 days.

Dan