diff --git a/src/modules/ad/interface/grpc-controllers/dtos/validators/decorators/is-after-or-equal.decorator.ts b/src/modules/ad/interface/grpc-controllers/dtos/validators/decorators/is-after-or-equal.decorator.ts
index 484e98d..fb6e734 100644
--- a/src/modules/ad/interface/grpc-controllers/dtos/validators/decorators/is-after-or-equal.decorator.ts
+++ b/src/modules/ad/interface/grpc-controllers/dtos/validators/decorators/is-after-or-equal.decorator.ts
@@ -2,6 +2,7 @@ import {
   registerDecorator,
   ValidationOptions,
   ValidationArguments,
+  isISO8601,
 } from 'class-validator';
 
 export function IsAfterOrEqual(
@@ -19,11 +20,22 @@ export function IsAfterOrEqual(
         validate(value: any, args: ValidationArguments) {
           const [relatedPropertyName] = args.constraints;
           const relatedValue = (args.object as any)[relatedPropertyName];
-          return (
-            typeof value === 'string' &&
-            typeof relatedValue === 'string' &&
-            value >= relatedValue
-          ); // you can return a Promise<boolean> here as well, if you want to make async validation
+          if (
+            !(
+              typeof value === 'string' &&
+              typeof relatedValue === 'string' &&
+              isISO8601(value, {
+                strict: true,
+                strictSeparator: true,
+              }) &&
+              isISO8601(relatedValue, {
+                strict: true,
+                strictSeparator: true,
+              })
+            )
+          )
+            return false;
+          return new Date(value) >= new Date(relatedValue);
         },
       },
     });
diff --git a/src/modules/ad/tests/unit/interface/has-day.decorator.spec.ts b/src/modules/ad/tests/unit/interface/has-day.decorator.spec.ts
new file mode 100644
index 0000000..ef27a62
--- /dev/null
+++ b/src/modules/ad/tests/unit/interface/has-day.decorator.spec.ts
@@ -0,0 +1,60 @@
+import { Frequency } from '@modules/ad/core/domain/ad.types';
+import { ScheduleItemDto } from '@modules/ad/interface/grpc-controllers/dtos/schedule-item.dto';
+import { HasDay } from '@modules/ad/interface/grpc-controllers/dtos/validators/decorators/has-day.decorator';
+import { Validator } from 'class-validator';
+
+describe('Has day decorator', () => {
+  class MyClass {
+    @HasDay('schedule', {
+      message: 'At least a day is required for a recurrent ad',
+    })
+    frequency: Frequency;
+
+    schedule: ScheduleItemDto[];
+  }
+
+  it('should return a property decorator has a function', () => {
+    const hasDay = HasDay('someProperty');
+    expect(typeof hasDay).toBe('function');
+  });
+
+  it('should validate a punctual frequency associated with a valid schedule', async () => {
+    const myClassInstance = new MyClass();
+    myClassInstance.frequency = Frequency.PUNCTUAL;
+    myClassInstance.schedule = [
+      {
+        time: '07:15',
+      },
+    ];
+    const validator = new Validator();
+    const validation = await validator.validate(myClassInstance);
+    expect(validation.length).toBe(0);
+  });
+
+  it('should validate a recurrent frequency associated with a valid schedule', async () => {
+    const myClassInstance = new MyClass();
+    myClassInstance.frequency = Frequency.RECURRENT;
+    myClassInstance.schedule = [
+      {
+        time: '07:15',
+        day: 1,
+      },
+    ];
+    const validator = new Validator();
+    const validation = await validator.validate(myClassInstance);
+    expect(validation.length).toBe(0);
+  });
+
+  it('should not validate a recurrent frequency associated with an invalid schedule', async () => {
+    const myClassInstance = new MyClass();
+    myClassInstance.frequency = Frequency.RECURRENT;
+    myClassInstance.schedule = [
+      {
+        time: '07:15',
+      },
+    ];
+    const validator = new Validator();
+    const validation = await validator.validate(myClassInstance);
+    expect(validation.length).toBe(1);
+  });
+});
diff --git a/src/modules/ad/tests/unit/interface/is-after-or-equal.decorator.spec.ts b/src/modules/ad/tests/unit/interface/is-after-or-equal.decorator.spec.ts
new file mode 100644
index 0000000..71ab685
--- /dev/null
+++ b/src/modules/ad/tests/unit/interface/is-after-or-equal.decorator.spec.ts
@@ -0,0 +1,45 @@
+import { IsAfterOrEqual } from '@modules/ad/interface/grpc-controllers/dtos/validators/decorators/is-after-or-equal.decorator';
+import { Validator } from 'class-validator';
+
+describe('Is after or equal decorator', () => {
+  class MyClass {
+    firstDate: string;
+
+    @IsAfterOrEqual('firstDate', {
+      message: 'secondDate must be after or equal to firstDate',
+    })
+    secondDate: string;
+  }
+
+  it('should return a property decorator has a function', () => {
+    const isAfterOrEqual = IsAfterOrEqual('someProperty');
+    expect(typeof isAfterOrEqual).toBe('function');
+  });
+
+  it('should validate a secondDate posterior to firstDate', async () => {
+    const myClassInstance = new MyClass();
+    myClassInstance.firstDate = '2023-07-20';
+    myClassInstance.secondDate = '2023-07-30';
+    const validator = new Validator();
+    const validation = await validator.validate(myClassInstance);
+    expect(validation.length).toBe(0);
+  });
+
+  it('should not validate a secondDate prior to firstDate', async () => {
+    const myClassInstance = new MyClass();
+    myClassInstance.firstDate = '2023-07-20';
+    myClassInstance.secondDate = '2023-07-19';
+    const validator = new Validator();
+    const validation = await validator.validate(myClassInstance);
+    expect(validation.length).toBe(1);
+  });
+
+  it('should not validate if dates are invalid', async () => {
+    const myClassInstance = new MyClass();
+    myClassInstance.firstDate = '2023-07-40';
+    myClassInstance.secondDate = '2023-07-19';
+    const validator = new Validator();
+    const validation = await validator.validate(myClassInstance);
+    expect(validation.length).toBe(1);
+  });
+});