```On 9/29/06, Jeremy Tregunna <jtregunna / blurgle.ca> wrote:
>
> On 06-09-29, at 08:59, Matthew Harris wrote:
>
> > On 9/29/06, Tanner Burson <tanner.burson / gmail.com> wrote:
> >> You mention that it can convert number of days/weeks into months.
> >> How do
> >> you deal with the fact that a "month" doesn't have a standard
> >> number of
> >> days?  Do you do as the Rails extension does by assuming a fixed
> >> number, or
> >> some other form of trickery?
> >
> > Since durations are only based on timespans of fixed lengths, they do
> > not work relatively. So there is no time-detection magic to determine
> > the days in a given month, because also durations don't distinguish
> > between what month it is (whether it be January or Feburary).
> > BigDuration, the class that supports years and months will assume 30
> > days as 1 month, and 12 months as 1 year.
>
> Just to add a little bit here, in Io, our Duration module doesn't
> could keep a list holding the number of days in a month (in the case
> of february, if a leap year is detected, replace the second item in
> the list (28) with 29). Now that extension is pretty easy, but right
> now we only keep track of years, days, hours, and so on. You might
> consider doing something similar. It's fairly straight forward.
>
> Also, out of curiosity, why have two Duration classes? I can't see
> how BigDuration would be required, perhaps could you elaborate a little?
>
> > Matt
>
> --
> Jeremy Tregunna
> jtregunna / blurgle.ca
>
>
>
>

Duration and BigDuration are separate because BigDuration
independantly deals with years and months. Duration, when given a year
or a month will automatically change those to the number of weeks. I
wanted to strictly limit Duration to consistent numbers (weeks, days,
hours, minutes, seconds) and BigDuration to the inconsistent numbers
(months).

--
Matt

```