diff --git a/addons/web/static/src/core/py_js/py_date.js b/addons/web/static/src/core/py_js/py_date.js
index 0d3ac955c4e..767c6144229 100644
--- a/addons/web/static/src/core/py_js/py_date.js
+++ b/addons/web/static/src/core/py_js/py_date.js
@@ -489,7 +489,7 @@ export class PyDateTime {
      * @returns {PyDateTime}
      */
     to_utc() {
-        const d = new Date(this.year, this.month, this.day, this.hour, this.minute, this.second);
+        const d = new Date(this.year, this.month -1, this.day, this.hour, this.minute, this.second);
         const timedelta = PyTimeDelta.create({ minutes: d.getTimezoneOffset() });
         return this.add(timedelta);
     }
diff --git a/addons/web/static/tests/core/py_js/py_date_tests.js b/addons/web/static/tests/core/py_js/py_date_tests.js
index 4058d2938f4..78c4e287620 100644
--- a/addons/web/static/tests/core/py_js/py_date_tests.js
+++ b/addons/web/static/tests/core/py_js/py_date_tests.js
@@ -71,6 +71,24 @@ QUnit.module("py", {}, () => {
             assert.strictEqual(JSON.stringify(evaluateExpr(expr)), `"2021-09-16 18:00:00"`);
         });
 
+        QUnit.test("to_utc in october with winter/summer change", (assert) => {
+            patchDate(2021, 9, 17, 10, 0, 0);
+            patchWithCleanup(Date.prototype, {
+                getTimezoneOffset() {
+                    const month = this.getMonth() // starts at 0;
+                    if (10 <= month || month <= 2) {
+                        //rough approximation
+                        return -60;
+                    } else {
+                        return -120;
+                    }
+                },
+            });
+            const expr =
+                "datetime.datetime(2022, 10, 17).to_utc()";
+            assert.strictEqual(JSON.stringify(evaluateExpr(expr)), `"2022-10-16 22:00:00"`);
+        });
+
         QUnit.test("datetime.datetime.combine", (assert) => {
             const expr =
                 "datetime.datetime.combine(context_today(), datetime.time(23,59,59)).strftime('%Y-%m-%d %H:%M:%S')";