Check if it works when:

- you use one of default joomla templates?

- search is displayed using search&list?

- there is only one search with calendars on the page

Also, which calendar do you use - JForm Calendar field or Calendar?

Please try to check all this things before you post your answer.

Hi,

Thanks Klas

- you use one of default joomla templates?

I try with Protostar but the calendard not work, the problem is the same.

- search is displayed using search&list?

Yes, with menu search&list

- there is only one search with calendars on the page

With one form search it's ok, the calendard work.

Is it a javascript conflict?

I use Calendar, not JForm Calendard field

Thanks,

Seb

Hi,

yes it seems that multiple instances of the same search type with calendars don't work, most likely a problem with ids that are generated only from search type id nad field name.. 

Try creating another search type for module with all the same fields just new calendar fields (with different name, but with the same storage).