ant-design/components/date-picker/locale/it_IT.tsx

import CalendarLocale from 'rc-calendar/lib/locale/it_IT';
import TimePickerLocale from '../../time-picker/locale/it_IT';

// Merge into a locale object
const locale = {
  lang: {
    placeholder: 'Selezionare la data',
    rangePlaceholder: ["Data d'inizio", 'Data di fine'],
    ...CalendarLocale,
  },
  timePickerLocale: {
    ...TimePickerLocale,
  },
};

// All settings at:
// https://github.com/ant-design/ant-design/issues/424

export default locale;