{ xtype: 'datefield',fieldLabel: _('bookings.arrival'),name: 'arrival',format: 'd/m/y',anchor: '48%' }
This question has been answered by doglegdesign. See the first response.
{ xtype: 'datefield',fieldLabel: _('bookings.arrival'),name: 'arrival',anchor: '48%' }
{ xtype: 'datefield',fieldLabel: _('bookings.arrival'),name: 'arrival', format:'Y-m-d H:i:s',anchor: '48%' }