This question is similar to Check if datepicker is open except that it pertains to a page that has multiple datepicker controls on it.
When there are multiple datepickers on a page, jQuery UI appears to only create one datepicker widget that is shared between all of the datepickers.
I am attempting to find a way, through the datepicker UI or otherwise, to find out which datepicker the widget is open for. Unfortunately the tried and true tests such as:
$('#someDatepicker').datepicker('widget').is(':visible');
return true regardless of which datepicker the widget is open for, as long as it is visible somewhere.