diff --git a/mapper/src/App.js b/mapper/src/App.js
index 9358fc2..1536703 100644
--- a/mapper/src/App.js
+++ b/mapper/src/App.js
@@ -345,11 +345,10 @@ function Menu({duration, setDuration, end, setEnd, slider, setSlider, submenu, s
 		if (!shareStart || !shareEnd) {
 			return true;
 		}
-		const proposedStartDate = moment(current).startOf('day');
-		const proposedEndDate = moment(proposedStartDate).add(...duration.delta);
+		const proposedDate = moment(current).startOf('day');
 
-		const isAfterOrOnShareStart = proposedStartDate.isSameOrAfter(shareStart, 'day');
-		const isBeforeOrOnShareEnd = proposedEndDate.isSameOrBefore(shareEnd, 'day');
+		const isAfterOrOnShareStart = proposedDate.isSameOrAfter(shareStart, 'day');
+		const isBeforeOrOnShareEnd = proposedDate.isSameOrBefore(shareEnd, 'day');
 
 		return isAfterOrOnShareStart && isBeforeOrOnShareEnd;
 	};