diff --git a/ui/jquery.ui.datepicker.js b/ui/jquery.ui.datepicker.js
index ff6ebad52..c23984530 100644
--- a/ui/jquery.ui.datepicker.js
+++ b/ui/jquery.ui.datepicker.js
@@ -1656,7 +1656,7 @@ $.extend(Datepicker.prototype, {
 
 	/* Find the number of days in a given month. */
 	_getDaysInMonth: function(year, month) {
-		return 32 - new Date(year, month, 32).getDate();
+		return 32 - this._daylightSavingAdjust(new Date(year, month, 32)).getDate();
 	},
 
 	/* Find the day of the week of the first of a month. */