nb-calendar-with-time not render timepicker on start

[pacocom]

    <nb-calendar-with-time
      #startCalendar
      (dateChange)="startDateChange($event)"
      [(date)]="start"
    ></nb-calendar-with-time>

start: Date | null = new Date('2025-10-23T09:14:13.007Z');
startDateChange(date: Date) {
console.log('START (OK, Now):', date);
}

Need to select a date day to appears timepicker

Why?