diff --git a/tests/unit/datepicker/datepicker_tickets.js b/tests/unit/datepicker/datepicker_tickets.js
index 38c5e89f3..cf9dcbc5e 100644
--- a/tests/unit/datepicker/datepicker_tickets.js
+++ b/tests/unit/datepicker/datepicker_tickets.js
@@ -3,6 +3,27 @@
  */
 (function($) {
 
-module("datepicker: tickets");
+module("datepicker: tickets", {
+	teardown: function() {
+		stop();
+		setTimeout(start, 13);
+	}
+});
+
+// http://forum.jquery.com/topic/several-breaking-changes-in-jquery-ui-1-8rc1
+test('beforeShowDay-getDate', function() {
+	var inp = init('#inp', {beforeShowDay: function(date) { inp.datepicker('getDate'); return [true, '']; }});
+	var dp = $('#ui-datepicker-div');
+	inp.val('01/01/2010').datepicker('show');
+	equals($('div.ui-datepicker-title').text(), 'January 2010', 'Initial month');
+	$('a.ui-datepicker-next', dp).click();
+	$('a.ui-datepicker-next', dp).click();
+	equals($('div.ui-datepicker-title').text(), 'March 2010', 'After next clicks');
+	inp.datepicker('hide').datepicker('show');
+	$('a.ui-datepicker-prev', dp).click();
+	$('a.ui-datepicker-prev', dp).click();
+	equals($('div.ui-datepicker-title').text(), 'November 2009', 'After prev clicks');
+	inp.datepicker('hide');
+});
 
 })(jQuery);
diff --git a/ui/jquery.ui.datepicker.js b/ui/jquery.ui.datepicker.js
index ffd20db2d..789afe1f1 100644
--- a/ui/jquery.ui.datepicker.js
+++ b/ui/jquery.ui.datepicker.js
@@ -603,6 +603,7 @@ $.extend(Datepicker.prototype, {
 		}
 		var beforeShow = $.datepicker._get(inst, 'beforeShow');
 		extendRemove(inst.settings, (beforeShow ? beforeShow.apply(input, [input, inst]) : {}));
+		inst.lastVal = null;
 		$.datepicker._lastInput = input;
 		$.datepicker._setDateFromField(inst);
 		if ($.datepicker._inDialog) // hide cursor
@@ -1224,9 +1225,11 @@ $.extend(Datepicker.prototype, {
 
 	/* Parse existing date and initialise date picker. */
 	_setDateFromField: function(inst, noDefault) {
+		if (inst.input.val() == inst.lastVal) {
+			return;
+		}
 		var dateFormat = this._get(inst, 'dateFormat');
-		inst.lastVal = inst.input ? inst.input.val() : null;
-		var dates = inst.lastVal;
+		var dates = inst.lastVal = inst.input ? inst.input.val() : null;
 		var date, defaultDate;
 		date = defaultDate = this._getDefaultDate(inst);
 		var settings = this._getFormatConfig(inst);