the best way to find this is in jquery.ui.datepicker-cc.js file
first find the _updateAlternative function and change this line:
$(altField).each(function() { $(this).val(dateStr); });
For example, I changed this:
$(altField).each(function() { $(this).val(dateStr); $(this).text(dateStr); });
Now you can put alternate text in any element you want. Hope this helps.
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