diff --git a/types/is-date-object/index.d.ts b/types/is-date-object/index.d.ts
index 75fc6b1796..7d22927284 100644
--- a/types/is-date-object/index.d.ts
+++ b/types/is-date-object/index.d.ts
@@ -2,10 +2,10 @@
 // Project: https://github.com/ljharb/is-date-object
 // Definitions by:  Adam Zerella <https://github.com/adamzerella>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version: 3.3
+// TypeScript Version: 3.0
 
 declare function isDateObject(value: Date): true;
 declare function isDateObject(value?: object): boolean;
-declare function isDateObject(value?: null | boolean | string | number | symbol | bigint | []): false;
+declare function isDateObject(value?: null | boolean | string | number): false;
 
 export = isDateObject;
diff --git a/types/is-date-object/package.json b/types/is-date-object/package.json
new file mode 100644
index 0000000000..9e02feea42
--- /dev/null
+++ b/types/is-date-object/package.json
@@ -0,0 +1,7 @@
+{
+    "private": true,
+    "types": "index",
+    "typesVersions": {
+        ">=3.1.0-0": { "*": ["ts3.1/*"] }
+    }
+}
\ No newline at end of file
diff --git a/types/is-date-object/ts3.1/index.d.ts b/types/is-date-object/ts3.1/index.d.ts
new file mode 100644
index 0000000000..3d09650996
--- /dev/null
+++ b/types/is-date-object/ts3.1/index.d.ts
@@ -0,0 +1,5 @@
+declare function isDateObject(value: Date): true;
+declare function isDateObject(value?: object): boolean;
+declare function isDateObject(value?: null | boolean | string | number | symbol | bigint | []): false;
+
+export = isDateObject;
diff --git a/types/is-date-object/ts3.1/is-date-object-tests.ts b/types/is-date-object/ts3.1/is-date-object-tests.ts
new file mode 100644
index 0000000000..9946c42d54
--- /dev/null
+++ b/types/is-date-object/ts3.1/is-date-object-tests.ts
@@ -0,0 +1,15 @@
+import isDate = require("is-date-object");
+
+isDate();
+isDate(undefined);
+isDate(null);
+isDate(false);
+isDate(true);
+isDate(42);
+isDate('foo');
+isDate((): void => {});
+isDate([]);
+isDate({});
+isDate(/a/g);
+isDate(new RegExp('a', 'g'));
+isDate(new Date());
diff --git a/types/is-date-object/ts3.1/tsconfig.json b/types/is-date-object/ts3.1/tsconfig.json
new file mode 100644
index 0000000000..7a40c93489
--- /dev/null
+++ b/types/is-date-object/ts3.1/tsconfig.json
@@ -0,0 +1,25 @@
+{
+    "compilerOptions": {
+      "module": "commonjs",
+      "lib": [
+        "es6"
+      ],
+      "noImplicitAny": true,
+      "noImplicitThis": true,
+      "strictNullChecks": true,
+      "strictFunctionTypes": true,
+      "baseUrl": "../../",
+      "typeRoots": [
+        "../../"
+      ],
+      "types": [
+
+      ],
+      "noEmit": true,
+      "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+      "index.d.ts",
+      "is-date-object-tests.ts"
+    ]
+}
diff --git a/types/is-date-object/ts3.1/tslint.json b/types/is-date-object/ts3.1/tslint.json
new file mode 100644
index 0000000000..e60c15844f
--- /dev/null
+++ b/types/is-date-object/ts3.1/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": "dtslint/dt.json"
+}
\ No newline at end of file