diff --git a/package.json b/package.json
index 09f4bc1..3cef41f 100644
--- a/package.json
+++ b/package.json
@@ -83,6 +83,11 @@
       "types": "./dist/storage.d.ts",
       "import": "./dist/storage.mjs",
       "default": "./dist/storage.js"
+    },
+    "./date-get-day": {
+      "types": "./dist/date-get-day.d.ts",
+      "import": "./dist/date-get-day.mjs",
+      "default": "./dist/date-get-day.js"
     }
   },
   "keywords": [],
@@ -105,4 +110,4 @@
     "tabWidth": 2,
     "useTabs": false
   }
-}
+}
\ No newline at end of file
diff --git a/src/entrypoints/date-get-day.d.ts b/src/entrypoints/date-get-day.d.ts
new file mode 100644
index 0000000..95e92a6
--- /dev/null
+++ b/src/entrypoints/date-get-day.d.ts
@@ -0,0 +1,3 @@
+interface Date {
+  getDay(): 0 | 1 | 2 | 3 | 4 | 5 | 6
+}
\ No newline at end of file
diff --git a/src/entrypoints/recommended.d.ts b/src/entrypoints/recommended.d.ts
index 7e6b2b4..ccf9475 100644
--- a/src/entrypoints/recommended.d.ts
+++ b/src/entrypoints/recommended.d.ts
@@ -6,3 +6,4 @@
 /// <reference path="set-has.d.ts" />
 /// <reference path="map-has.d.ts" />
 /// <reference path="array-index-of.d.ts" />
+/// <reference path="date-get-day.d.ts" />
\ No newline at end of file
diff --git a/src/tests/date-get-day.ts b/src/tests/date-get-day.ts
new file mode 100644
index 0000000..69c590c
--- /dev/null
+++ b/src/tests/date-get-day.ts
@@ -0,0 +1,7 @@
+import { doNotExecute, Equal, Expect } from "./utils";
+
+doNotExecute(() => {
+  const result = new Date().getDay();
+
+  type tests = [Expect<Equal<typeof result, 0 | 1 | 2 | 3 | 4 | 5 | 6>>];
+});