diff --git a/plugins/calendar/lib/js/fullcalendar.js b/plugins/calendar/lib/js/fullcalendar.js
index a67da0e9..3b791078 100644
--- a/plugins/calendar/lib/js/fullcalendar.js
+++ b/plugins/calendar/lib/js/fullcalendar.js
@@ -1513,9 +1513,9 @@ function parseISO8601(s, ignoreTimezone) { // ignoreTimezone defaults to false
 	if (!m) {
 		return null;
 	}
-	var date = new Date(m[1], 0, 1);
+	var date = new Date(m[1], 0, 2);
 	if (ignoreTimezone || !m[13]) {
-		var check = new Date(m[1], 0, 1, 9, 0);
+		var check = new Date(m[1], 0, 2, 9, 0);
 		if (m[3]) {
 			date.setMonth(m[3] - 1);
 			check.setMonth(m[3] - 1);