How do we only allow input on a mate date picket where user can type a date but should not allow letters only numbers and user can also select a date from date picket if he wants to.

I tried to use mask but mask and matDatepicker does not work together and causes an issue.

#code

 <mat-form-field appearance="fill" class="w-49per">
                <mat-label>Proposed Term Start</mat-label>
                  <input 
                    name = "proposedTermStart" 
                    matInput
                    (dateChange)="setProposedScheduleInitialStartDate()"
                    [matDatepicker]="proposedTermStart" 
                    [min]="currentDate"
                    [(ngModel)]="dealDispositionFormFields.proposedTermStart"
                    >
                  <mat-datepicker-toggle matSuffix [for]="proposedTermStart"></mat-datepicker-toggle>
                  <mat-datepicker #proposedTermStart></mat-datepicker>
              </mat-form-field>