// date-picker.ts
import { Component } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { MatDatepickerModule } from '@angular/material/datepicker';
import { DateAdapter } from '@angular/material/core';

@Component({
  imports: [CommonModule, FormsModule, MatDatepickerModule]
})
export class SelectDatesComponent {

  dateFilter = (d: Date | null): boolean => {
    const today = this.dateAdapter.today();
    if (d) {
      return this.dateAdapter.compareDate(today, d) <= 0;
    } else {
      return false;
    }
  }

  constructor(private dateAdapter: DateAdapter<Date | null>) {}

}

<!-- datepicker.html -->
<mat-form-field>
  <mat-date-range-input [rangePicker]="picker"[dateFilter]="dateFilter">
    <input matStartDate />
    <input matEndDate/>
  </mat-date-range-input>
</mat-form-field>
<mat-date-range-picker #picker />