Fixes trentrichardson#391 - Selecting input populates the date when empty

Author: trentrichardson

jquery-ui-timepicker-addon.js

@@ -773,7 +773,7 @@ $.extend(Timepicker.prototype, {
 				second != this.second || millisec != this.millisec ||
 				(this.ampm.length > 0 &&
 				    (hour < 12) != ($.inArray(this.ampm.toUpperCase(), this.amNames) !== -1)) ||
-				timezone != this.timezone);
+				((this.timezone == null && timezone != this.defaultTimezone) || (this.timezone != null && timezone != this.timezone)));
 
 		if (hasChanged) {
 
@@ -832,12 +832,13 @@ $.extend(Timepicker.prototype, {
 			timeAvailable = dt !== null && this.timeDefined;
 		this.formattedDate = $.datepicker.formatDate(dateFmt, (dt === null ? new Date() : dt), formatCfg);
 		var formattedDateTime = this.formattedDate;
+		
 		// remove following lines to force every changes in date picker to change the input value
 		// Bug descriptions: when an input field has a default value, and click on the field to pop up the date picker. 
 		// If the user manually empty the value in the input field, the date picker will never change selected value.
 		//if (dp_inst.lastVal !== undefined && (dp_inst.lastVal.length > 0 && this.$input.val().length === 0)) {
 		//	return;
-        //}
+		//}
 
 		if (this._defaults.timeOnly === true) {
 			formattedDateTime = this.formattedTime;