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Postings from February 2009
On Tue, 17 Feb 2009, Darren Duncan wrote:
> Talking about dates and times, I have some suggestions.
>
> First of all, I don't think that most DateTime stuff belongs in IO. The
> class definitions to represent a date or time or duration etc value, as well
> as operators to convert date formats etc or add/subtract etc dates are
> strictly internal, same as number or string operations. Only the routines to
> fetch the current system time and the like belong in IO, or routines
> concerning file timestamps etc.
I agree they don't belong in that part of the spec; I've just written
another e-mail about that ("Spec reorganisation").
> Second of all, I think a more generic term than DateTime should be used to
> name an object that represents an instant in time; for example I suggest
> calling it "Instant". The name "Instant" fits in a lot better in the company
> of other generic sounding temporal data types like "Duration" etc. Then, you
> can say that things like DateTime, Date, Time, etc are subtypes of Instant.
Love the name; I'll do the rename as soon as the Spec reorganisation
is sorted out.
It also means that we can use DateTime to refer to
Instant+Duration+... :).
> See also http://search.cpan.org/dist/Muldis-D/lib/Muldis/D/Ext/Temporal.pod
> where I've specced out such matters, and that illustrates something I
> recommend for you. My Instant types very closely resemble both the Perl
> DateTime library as well as the SQL temporal types, which are actually very
> similar, though I've generalized it a bit. This spec explicitly does not
> support time zones (it has UTC or floating, that's it) and it doesn't include
> conversions with strings, but it has the foundation on which such could be
> built. And yours doesn't have to be the same of course.
I'll look into it :). Thanks,
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| Name: Tim Nelson | Because the Creator is, |
| E-mail: wayland@wayland.id.au | I am |
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