diff --git a/packages/example-nextjs/src/app/Form.tsx b/packages/example-nextjs/src/app/Form.tsx
index b21f046..9428125 100644
--- a/packages/example-nextjs/src/app/Form.tsx
+++ b/packages/example-nextjs/src/app/Form.tsx
@@ -104,7 +104,7 @@ export const Form = ({ className }: { className?: string }) => {
 };
 
 const tags = [
-  { id: '1', value: { text: '1' } },
-  { id: '2', value: { text: '2' } },
-  { id: '3', value: { text: '3' } }
+  { id: '1', value: { text: '1', time: new Date() } },
+  { id: '2', value: { text: '2', time: new Date() } },
+  { id: '3', value: { text: '3', time: new Date() } }
 ]
diff --git a/packages/example-nextjs/src/app/form.ts b/packages/example-nextjs/src/app/form.ts
index 8068e14..d32db4b 100644
--- a/packages/example-nextjs/src/app/form.ts
+++ b/packages/example-nextjs/src/app/form.ts
@@ -9,5 +9,5 @@ type Form = {
   name: string;
   age: number | string;
   'agree to terms': boolean;
-  tags: { id: string, value: { text: string }}[]
+  tags: { id: string, value: { text: string, time: Date }}[]
 };
diff --git a/packages/url-state/constants.ts b/packages/url-state/constants.ts
index b2294d3..09163c8 100644
--- a/packages/url-state/constants.ts
+++ b/packages/url-state/constants.ts
@@ -3,6 +3,7 @@ export const SYMBOLS = {
   null: '∙null',
   undefined: '∙undefined',
   number: '∓',
+  date: '⏲',
   arrayL: '⦋',
   arrayR: '⦌',
   objectL: '❴',
diff --git a/packages/url-state/encoder.test.ts b/packages/url-state/encoder.test.ts
index b2f40fd..9ad9c56 100644
--- a/packages/url-state/encoder.test.ts
+++ b/packages/url-state/encoder.test.ts
@@ -23,6 +23,13 @@ describe('encoder', () => {
     });
   });
 
+
+  it('date', () => {
+    const d = new Date('2024-06-28T09:10:38.763Z')
+    expect(encode(d)).toStrictEqual('⏲2024-06-28T09:10:38.763Z');
+  });
+
+
   it('boolean', () => {
     expect(encode(true)).toStrictEqual('🗵true');
     expect(encode(false)).toStrictEqual('🗵false');
@@ -96,6 +103,12 @@ describe('decoder', () => {
     expect(decode('∙undefined')).toStrictEqual(undefined);
   });
 
+  it('date', () => {
+    const dateString = '⏲2024-06-28T09:10:38.763Z'
+    const date = new Date(dateString.slice(1))
+    expect(decode(dateString)).toStrictEqual(date);
+  });
+
   it('complex', () => {
     expect(
       decode(
diff --git a/packages/url-state/encoder.ts b/packages/url-state/encoder.ts
index 4a2261f..b74dc30 100644
--- a/packages/url-state/encoder.ts
+++ b/packages/url-state/encoder.ts
@@ -8,6 +8,8 @@ export function encode(payload: unknown): string{
     case 'function':
     case 'symbol':
       return '';
+    case 'date':
+      return SYMBOLS.date + (payload as Date).toISOString()
     case 'string':
       return encodeURIComponent(payload as string);
     case 'number':
@@ -43,6 +45,7 @@ const replacer = (key: string, value: unknown) => {
 const decodeStr = (str: string) => {
   if (str.match(/^∓/)) return Number.parseFloat(str.replaceAll('∓', ''));
   if (str.match(/^🗵/)) return str.includes('true') ? true : false;
+  if (str.match(/^⏲/)) return new Date(str.slice(1));
   if (str === SYMBOLS.null) return null;
   if (str === SYMBOLS.undefined) return undefined;
   return decodeURIComponent(str);
diff --git a/packages/url-state/utils.test.ts b/packages/url-state/utils.test.ts
index bd54a13..59705a7 100644
--- a/packages/url-state/utils.test.ts
+++ b/packages/url-state/utils.test.ts
@@ -7,6 +7,11 @@ describe('typeOf', () => {
     expect(typeOf('5')).toEqual('string');
   });
 
+  it('date', () => {
+    const d = new Date()
+    expect(typeOf(d)).toEqual('date');
+  });
+
   it('number', () => {
     expect(typeOf(5)).toEqual('number');
     expect(typeOf(3.14567)).toEqual('number');
diff --git a/packages/url-state/utils.ts b/packages/url-state/utils.ts
index 68d7230..259c2e1 100644
--- a/packages/url-state/utils.ts
+++ b/packages/url-state/utils.ts
@@ -1,5 +1,6 @@
 export type Type =
   | 'string'
+  | 'date'
   | 'boolean'
   | 'number'
   | 'bigint'
@@ -13,10 +14,12 @@ export type Type =
 export const typeOf = (val: unknown): Type => {
   const isNull = val === null;
   const isArray = Array.isArray(val);
-  const isObject = !isNull && !isArray && typeof val === 'object';
+  const isDate = val instanceof Date
+  const isObject = !isNull && !isDate && !isArray && typeof val === 'object';
 
   return (
     (isNull && 'null') ||
+    (isDate && 'date') ||
     (isArray && 'array') ||
     (isObject && 'object') ||
     typeof val