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Well, judging from the picture, there are two options.
If all buttons are default red, and go gray when blocked, he would allow no day-of-month values above 13, but as we can see he allows day-of-month=13.
If all buttons are default gray, and go red when blocked, he would allow for example the weekday to be +'ed to make the date Friday the 13th August, 2010.
Whatever it is that makes the programmer superstitious, it's not shown in this screenshot.
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