diff --git a/thrimbletrimmer/scripts/IO.js b/thrimbletrimmer/scripts/IO.js
index 54ece59..faf3728 100644
--- a/thrimbletrimmer/scripts/IO.js
+++ b/thrimbletrimmer/scripts/IO.js
@@ -108,7 +108,7 @@ function parseDuration(duration) {
 		direction = -1;
 	}
 	const [hours, mins, secs] = duration.split(":");
-	return (3600 * parseInt(hours) + 60 * (mins || "0") + (secs || "0")) * direction;
+	return (3600 * parseInt(hours) + 60 * (parseInt(mins) || 0) + (parseFloat(secs) || 0)) * direction;
 }
 
 function toBustime(date) {