diff --git a/lib/utils.js b/lib/utils.js
index 3390ead..08d93b8 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -1,13 +1,22 @@
 'use strict';
 
+const moment = require('moment');
+
 const dateRange = (start, end) => {
-	if (start && end)
+	if (start && end) {
+		if (start instanceof Date) {
+			start = moment(start).format('YYYY-MM-DD');
+		}
+		if (end instanceof Date) {
+			end = moment(end).format('YYYY-MM-DD');
+		}
 		return {
 			DateRange: {
 				Start: start,
 				End: end,
 			},
 		};
+	}
 
 	return {};
 };