Currently, the default when subtracting datetimes is
> to break down the duration into multiple parts, months, > days, minutes, seconds, and nanoseconds.
> days piece we can derive weeks.
From the months piece we can derive years, and from the
Rick Measham responded:
Except, as Flavio points out, for non-gregorian calendars.
Perhaps the Calendar classes can offer 'unit conversion' methods suitable for their particular idiom. Datetime could utilize these conversion methods when found, otherwise default to 'Gregorian' style calculations.
Matt
