WHOOPS - didn't mean to post until I'd finished...
In IE6 the first column of each group displays the shortened name for the day and date.
IE6 - Wed Mar 17 - and this wraps to a second line.
My version of Opera 7 displays the FULL name for the day i.e. Wednesday followed by a comma and space, then the numerals for the date. Anything longer than 10 characters then disappears, and doesn't wrap to another line, so "Wedneday, " fits in the box but doesn't have any numbers. "Monday, 29" just fits in a box but "Tuesday, 3" SHOULD read "Tuesday, 30".
Apart from this, the rest of it seems to do what it is supposed to.
Bug report complete...
Quack!
GtD.