Hello,
This bug only appears when using a culture parameter (tested with ‘de-DE’ and ‘fr-FR’)
You can reproduce it on your own example http://jsfiddle.net/jqwidgets/jbaEG/
When you display the month of March for the first time, the first line of the calendar displays 28 (February), 1 (March), 2, 3, 4, 5, 6. It’s OK.
Then go back to February and return to March. Or go to April, then back to March
Now the first line of March shows 21 (February), 22, 23, 24, 25, 26, 27. And the second line displays 28 (February), 1 (March), 2, 3, 4, 5, 6
When you remove the culture parameter, the first line of March is always the same when you navigate and go bak to March
Perhaps because first day of week is Monday ?
Can you fix this bug ?
Best regards