diff --git a/index.js b/index.js
index 8696070..0c457ea 100644
--- a/index.js
+++ b/index.js
@@ -33,7 +33,7 @@ Forecast.prototype.buildUrl = function buildUrl (latitude, longitude, time, opti
   var query = '?' + qs.stringify(options);
   var url = this.url + latitude + ',' + longitude;
 
-  if (typeof time === 'number') {
+  if ((typeof time === 'number')||(typeof time === 'string')) {
     url += ',' + time;
   }