diff --git a/ics.js b/ics.js
index 91ac15d..795c58f 100644
--- a/ics.js
+++ b/ics.js
@@ -51,13 +51,13 @@ var ics = function() {
 			var end_date = new Date(stop);
 
 			var start_year = ('0000' + (start_date.getFullYear().toString())).slice(-4);
-			var start_month = ('00' + (start_date.getMonth().toString())).slice(-2) + 1;
+			var start_month = ('00' + (start_date.getMonth().toString())).slice(-2);
 			var start_day = ('00' + (start_date.getDate().toString())).slice(-2);
 			var start = start_year + (Number(start_month)+1) + start_day;
 
 			var end_year = ('0000' + (end_date.getFullYear().toString())).slice(-4);
 			var end_month = ('00' + (end_date.getMonth().toString())).slice(-2);
-			var end_day = ('00' + ((end_date.getDate()+1).toString())).slice(-2);
+			var end_day = ('00' + (end_date.getDate().toString())).slice(-2);
 			var end = end_year + (Number(end_month)+1) + end_day;
 
 			var calendarEvent = [