diff --git a/src/scripting_api/util.js b/src/scripting_api/util.js
index 1b6b72db9ce8d..d393fa53f26c0 100644
--- a/src/scripting_api/util.js
+++ b/src/scripting_api/util.js
@@ -474,17 +474,14 @@ class Util {
           data.month = parseInt(value) - 1;
         },
       },
+      // Weekday names are matched but must not set the day of the month.
       dddd: {
         pattern: `(${days.join("|")})`,
-        action: (value, data) => {
-          data.day = days.indexOf(value);
-        },
+        action: () => {},
       },
       ddd: {
         pattern: `(${days.map(day => day.substring(0, 3)).join("|")})`,
-        action: (value, data) => {
-          data.day = days.findIndex(day => day.substring(0, 3) === value);
-        },
+        action: () => {},
       },
       dd: {
         pattern: "(\\d{2})",
diff --git a/test/unit/scripting_spec.js b/test/unit/scripting_spec.js
index d401003ef3b89..22d11789a28e1 100644
--- a/test/unit/scripting_spec.js
+++ b/test/unit/scripting_spec.js
@@ -1398,6 +1398,18 @@ describe("Scripting", function () {
         expect(value).toEqual([15, 16, 21]);
       });
 
+      it("should preserve the day of the month when matching weekday names", async () => {
+        const value = await myeval(`[
+          util.scand("yyyy-mm-dd ddd", "2026-10-25 Sun").getDate(),
+          util.scand("yyyy-mm-dd dddd", "2026-10-25 Sunday").getDate(),
+          util.scand("ddd yyyy-mm-dd", "Sun 2026-10-25").getDate(),
+          util.scand("dddd yyyy-mm-dd", "Sunday 2026-10-25").getDate(),
+          util.scand("yyyy-mm-dd ddd", "2026-10-31 Sat").getDate(),
+          util.scand("ddd yyyy-mm-dd", "Sat 2026-10-31").getDate(),
+        ]`);
+        expect(value).toEqual([25, 25, 25, 25, 31, 31]);
+      });
+
       it("should handle a format with repeated specifiers", async () => {
         const cFormat = "Hm".repeat(40);
         const cDate = `${"1".repeat(84)}x`;