diff --git a/src/main.js b/src/main.js
index d008d91..f05372a 100644
--- a/src/main.js
+++ b/src/main.js
@@ -123,7 +123,7 @@ class WeatherChartCard extends LitElement {
     var lengthUnit = this._hass.config.unit_system.length;
     var precipUnit = lengthUnit === 'km' ? this.ll('uPrecip')[0] : this.ll('uPrecip')[1];
     var forecast = weather.attributes.forecast.slice(0, forecastItems);
-    if (new Date(forecast[1].datetime) - new Date(forecast[0].datetime) === 36e5)
+    if ((new Date(forecast[1].datetime) - new Date(forecast[0].datetime)) < 864e5)
       var mode = 'hourly';
     else
       var mode = 'daily';