diff --git a/static/src/js/canvas.js b/static/src/js/canvas.js
index 7d23f3b2dac98a9f8d64bd85f60169de054e5deb..b75f57f4f20560fc1cd254f3ad6a17b2917547d7 100644
--- a/static/src/js/canvas.js
+++ b/static/src/js/canvas.js
@@ -669,12 +669,12 @@ odoo.define("oacc_portal_overview_cdc.canvas", function (require) {
             }
 
             // Disable buttons if first or last date
-            if (this.last_day >= this.maxDate) {
+            if (Date.parse(this.last_day) >= Date.parse(this.maxDate)) {
                 $('button[id="next-period"]').prop("disabled", true);
             } else {
                 $('button[id="next-period"]').prop("disabled", false);
             }
-            if (this.first_day <= this.minDate) {
+            if (Date.parse(this.first_day) <= Date.parse(this.minDate)) {
                 $('button[id="previous-period"]').prop("disabled", true);
             } else {
                 $('button[id="previous-period"]').prop("disabled", false);