$('#datetimepicker12').datetimepicker({
            inline: true,
            sideBySide: true,
            date: new Date(1547870400000)
            });
    });

$('#datetimepicker12').datetimepicker({
            inline: true,
            sideBySide: true,
            date: new Date(date)
            });
    });
  document.write(date);