diff --git a/calendar/js/et2_widget_planner.js b/calendar/js/et2_widget_planner.js
index 3c20030501..adaf579418 100644
--- a/calendar/js/et2_widget_planner.js
+++ b/calendar/js/et2_widget_planner.js
@@ -1843,7 +1843,7 @@ var et2_calendar_planner = et2_valueWidget.extend([et2_IDetachedDOM, et2_IResize
 				var row = $j(_ev.target).closest('.calendar_plannerRowWidget');
 				var data = row.length ? row[0].dataset : {};
 				this.egw().open(null, 'calendar', 'add', jQuery.extend({
-					start: date.toJSON(),
+					date: date.toJSON(),
 					hour: date.getUTCHours(),
 					minute: date.getUTCMinutes()
 				},data) , '_blank');
@@ -1895,7 +1895,7 @@ var et2_calendar_planner = et2_valueWidget.extend([et2_IDetachedDOM, et2_IResize
 			// Default handler to open a new event at the selected time
 			// TODO: Determine date / time more accurately from position
 			this.egw().open(null, 'calendar', 'add', {
-				date: _ev.target.dataset.date || this.day_list[0],
+				date: _ev.target.dataset.date || this.options.start_date.toJSON(),
 				hour: _ev.target.dataset.hour || this.options.day_start,
 				minute: _ev.target.dataset.minute || 0
 			} , '_blank');