diff --git a/js/chart.js b/js/chart.js
index 83e408c..64e96f4 100644
--- a/js/chart.js
+++ b/js/chart.js
@@ -18,34 +18,35 @@ const chart_options = {
 };
 
 function update_chart(input_data, possibilities) {
-  var ctx = $("#chart");
-
-  datasets = [
-    {
+  let ctx = $("#chart"),
+  datasets = [{
       label: i18next.t("output.chart.input"),
       data: input_data.slice(1),
       fill: false,
-    },
-    {
+    }, {
       label: i18next.t("output.chart.minimum"),
       data: possibilities[0].prices.slice(1).map(day => day.min),
       fill: false,
-    },
-    {
+    }, {
       label: i18next.t("output.chart.maximum"),
       data: possibilities[0].prices.slice(1).map(day => day.max),
       fill: "-1",
     },
-  ];
+  ],
+  labels = [i18next.t("weekdays.sunday")].concat(...[i18next.t("weekdays.abr.monday"), i18next.t("weekdays.abr.tuesday"), i18next.t("weekdays.abr.wednesday"), i18next.t("weekdays.abr.thursday"), i18next.t("weekdays.abr.friday"), i18next.t("weekdays.abr.saturday")].map(
+      day => [i18next.t("times.morning"),
+        i18next.t("times.afternoon")].map(
+        time => `${day} ${time}`)));
 
   if (chart_instance) {
     chart_instance.data.datasets = datasets;
+    chart_instance.data.labels = labels;
     chart_instance.update();
   } else {
     chart_instance = new Chart(ctx, {
       data: {
         datasets: datasets,
-        labels: [i18next.t("weekdays.sunday"), i18next.t("weekdays.abr.monday") + " " + i18next.t("times.morning"), i18next.t("weekdays.abr.monday") + " " + i18next.t("times.afternoon"), i18next.t("weekdays.abr.tuesday") + " " + i18next.t("times.morning"), i18next.t("weekdays.abr.tuesday") + " " + i18next.t("times.afternoon"), i18next.t("weekdays.abr.wednesday") + " " + i18next.t("times.morning"), i18next.t("weekdays.abr.wednesday") + " " + i18next.t("times.afternoon"), i18next.t("weekdays.abr.thursday") + " " + i18next.t("times.morning"), i18next.t("weekdays.abr.thursday") + " " + i18next.t("times.afternoon"), i18next.t("weekdays.abr.friday") + " " + i18next.t("times.morning"), i18next.t("weekdays.abr.friday") + " " + i18next.t("times.afternoon"), i18next.t("weekdays.abr.saturday") + " " + i18next.t("times.morning"), i18next.t("weekdays.abr.saturday") + " " + i18next.t("times.afternoon")],
+        labels: labels
       },
       options: chart_options,
       type: "line",