Fix heatmap month titles in Western Hemisphere

diff --git a/app/assets/javascripts/heatmap.js b/app/assets/javascripts/heatmap.js
index 058f71cfe4b88c05e8f23c27af657ce9ec550b90..c557f96e39ced41f9fc6ad3555f1284f91a9a3e2 100644 (file)
--- a/app/assets/javascripts/heatmap.js
+++ b/app/assets/javascripts/heatmap.js
@@ -33,7 +33,7 @@ document.addEventListener("DOMContentLoaded", () => {
         type: "month",
         gutter: 4,
         label: {
-          text: (timestamp) => monthNames[new Date(timestamp).getMonth() + 1],
+          text: (timestamp) => monthNames[new Date(timestamp).getUTCMonth() + 1],
           position: "top",
           textAlign: "middle"
         },