diff --git a/dist/index.js b/dist/index.js
index ad91831..a7aedbf 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -56,7 +56,7 @@ export function encodeTime(now, len) {
     if (now < 0) {
         throw createError("time must be positive");
     }
-    if (Number.isInteger(now) === false) {
+    if (Number.isInteger(Number(now)) === false) { 
         throw createError("time must be an integer");
     }
     let mod;