[btbuildem]

Looks reminiscent of a slide rule!

Very graceful in how it shows the interaction between the different lengths and frequencies of cycles (eg, days of week, months)

I wonder how they handle the changing number of days per month.. always keep 31, and just skip the extras every other month?

[DougBTX]

They always keep 31, but skip past it:

        var fdate = (d.getDate() - 1.0) + fhours / 24.0;
        document.getElementById('date').setAttribute("transform", "rotate(" + fdate / 31.0 * -360.0 + ", 400,300)");