[whatwg] Dates and coordinates in HTML5

Andy Mabbett andy at pigsonthewing.org.uk
Wed Feb 25 03:32:38 PST 2009

In message
<7c2a12e20902241613v7ba27c60q433fd84a74279318 at mail.gmail.com>, Aryeh
Gregor <Simetrical+w3c at gmail.com> writes

>the emphasis on clear and immediate use-cases.  I didn't notice you
>mentioning any of those in your posts.  What are some examples of
>actual, concrete applications with user-visible functionality that
>would be aided by extending <time> as you propose?

I'm surprised that you missed all this:

        I have considerable experience of marking up dates in
        microformats, [...] for historic events, on Wikipedia and
        Wikimedia Commons.


        Use-cases for machine-readable date mark-up are many: as well as
        the aforesaid calendar interactions, they can be used for
        sorting; for searching ("find me all the pages about events in
        1923" — recent developments in Yahoo's YQL searching API
        (which now supports searching for microformats):


        have opened up a whole new set of possibilities, which is only
        just beginning to be explored). They can be mapped visually on a


        or similar time-line. They can be translated into other
        languages more effectively than raw prose; they can be
        disambiguated (does “5/6/09" mean “5th June 2009? or “6th
        May 2009"?); and they can be presented in the user's preferred
        format (I might want to see “5th June 2009"; you might see
        “June 5, 2009" — such presentational preferences have
        generated arguments of little-endian proportions on Wikipedia).

        hCalendar microformats are already used to mark up imprecise
        dates ("June 1977"; "2009")


        Surely the use case for marking-up a sortable table of Roman
        emperors, should allow all such emperors, and not just those who
        ruled from 0001AD, to be included?

in my original post.

Andy Mabbett

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