Within a form, I have inserted a date field as required. It is not possible to validate the form even if the date has been defined. An alert box saays the field is required.
Please try again with default joomla or mambo template and with default joomla installation: a template or module or mambot or CB plugin can interfer sometimes if it has buggy javascript.
I could reproduce this bug on two different websites.
Among the two websites, one of them received a totally fresh install.
Is there a problem with the French language plugin?