Fix for the timezone issues (thanks to Tenzin NL on https://code.goog…

…le.com/p/jquery-datepicker/issues/detail?id=362)

date.js

@@ -317,8 +317,15 @@ Date.fullYearStart = '20';
 	 * @cat Plugins/Methods/Date
 	 */
 	add("addDays", function(num) {
-		//this.setDate(this.getDate() + num);
-		this.setTime(this.getTime() + (num*86400000) );
+		var timezoneOffsetBefore = this.getTimezoneOffset(),
+			timezoneOffsetAfter;
+        this.setTime(this.getTime() + (num*86400000) );
+        timezoneOffsetAfter = this.getTimezoneOffset();
+
+        // If the timezone has changed between days then adjust the time to reflect this
+        if(timezoneOffsetAfter !== timezoneOffsetBefore){
+                this.setTime(this.getTime() + ((timezoneOffsetAfter-timezoneOffsetBefore) * 60 * 1000));
+        }
 		return this;
 	});
 
@@ -418,9 +425,9 @@ Date.fullYearStart = '20';
 			.split('D').join(this.getDayName(true))
 			.split('mmmm').join(this.getMonthName(false))
 			.split('mmm').join(this.getMonthName(true))
-			.split('mm').join(_zeroPad(this.getMonth()+1))
-			.split('hh').join(_zeroPad(this.getHours()))
-			.split('min').join(_zeroPad(this.getMinutes()))
+			.split('mm').join(_zeroPad(this.getMonth()+1))
+			.split('hh').join(_zeroPad(this.getHours()))
+			.split('min').join(_zeroPad(this.getMinutes()))
 			.split('ss').join(_zeroPad(this.getSeconds()));
 	});