I am new to vue js, I am not sure why my code is not working, what I want is make a input field as a date-picker to accept the old dates only as its a birthday field

I used the max attribute but it seems not working or I am doing something wrong, so please help me to know what the issue, thanks in advance

Here my component code :

  <template>
<div>
<div class="md:w-7/12 mx-auto">
  <div class="flex flex-wrap -mx-3 mt-6">
    <div class="w-full px-3 mb-6 md:mb-0">
      <label
        class="block tracking-wide text-gray-700 text-xs font-bold mb-2"
      >
        Birth date
      </label>
      <div class="relative">
        <v-date-picker
          v-model="form.birthday"
          :max="maxDate"
          @input="handleDateInput"
        >
          <template v-slot:input="{ inputEvents, inputValue }">
            <input
              :value="inputValue"
              v-on="inputEvents"
              id="grid-birthdate"
              type="text"
              name="birthdate"
              :errors="validations['birthdate']"
              class="focus:ring-primary focus:border-primary block w-full sm:text-sm 
border border-gray-300 bg-gray-100 appearance-none outline-none"
            />
          </template>
        </v-date-picker>
      </div>
    </div>
  </div>
</div>
</div>
</template>

<script>
//import Form from "vform";

export default {
data() {
return {
  form: {
    birthday: null,
  },
  maxDate: new Date("2008-09-01").toISOString().split("T")[0],
  validations: [],
  countries: [],
};
},
mounted() {
  //
},
computed: {},
methods: {
handleDateInput(value) {
  console.log("Date Input Event:", value);
  this.form.birthday = value; // Ensure the value is updated
},
// getDisableDatesFunction(maxDate) {
//     const maxDateParsed = maxDate;
//     return (date) => {
//         console.log(
//             "Disabling dates after:",
//             maxDateParsed.toISODate()
//         );
//         console.log("Current date being checked:", date);
//         return (
//             DateTime.fromISO(date).toJSDate() > 
maxDateParsed.toJSDate()
//         );
//     };
// },
},
};
</script>

<style></style>

BTW I tried also disable the future dates but also faced some issues, and the whole date-picker disabled, but anyway I think better to use max.