PrimeNG DataTable order by date field descending?

Question

I am using PrimeNG datatable for the grid data, I would like to order the date column by descending order.

Tried using sortBy & sortOrder attributes from dataTable, but nothing works for me.

my code below:

    <p-dataTable [value]="dataList"
    sortMode="single"
    reorderableColumns="true"
    [globalFilter]="gbs"
    [responsive]="true"
    [rows]="10"
    [paginator]="true">
        <p-column field="firstName" header="FirstName" [sortable]="true">
            <ng-template let-row="rowData" pTemplate type="body">
                <strong>{{row.firstName}}</strong>
            </ng-template>
        </p-column>
        <p-column field="lastName" header="lastName" [sortable]="true">
            <ng-template let-row="rowData" pTemplate type="body">
                <strong>{{row.lastName}}</strong>
            </ng-template>
        </p-column>
        <p-column field="age" header="age" [sortable]="true">
            <ng-template let-row="rowData" pTemplate type="body">
                <strong>{{row.age}}</strong>
            </ng-template>
        </p-column>
        <p-column field="date" header="date" [sortable]="true">
            <ng-template let-row="rowData" pTemplate type="body">
                <strong>{{row.date}}</strong>
            </ng-template>
        </p-column>
</p-dataTable>

Need some spark to move forward... Thanks