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Also, I use a laptop with no scroll wheel. There are ways to do scrolling, like clicking both buttons, but it doesn't seem to send all the scroll wheel events. So I can't even find a way to get that version of the calendar to work.

An alternative to both might be to use a linear fisheye. It would just need a selection for 31 days at the bottom, 12 months in the middle, and a few years at the top. The thing that you would probably need to change for the fisheye is not scrolling between months from the day row or years from the months row. In some ways, this is a bit more intuitive anyway.

If it's responding to sideways scroll, then multitouch users may discover that by themselves.

Update: no, it seems to be buggy in Safari and scrolling is soaked up by the browser, so I can't two finger scroll on the calendar.

Agreed, it wasn't immediately obvious how to scroll the non-buttoned version.

You probably right, but "can" is not "must" :-)