Ho to convert date from mysql into gijgo datepicker

In my I jQuery v3 / Bootstrap v4.1.2 application, I use gijgo.com/datepicker and I need to show some default value in datepicker from “2019-04-09” in mysql database into “14 December, 2017”, as datepicker has options:

$('#check_in_datepicker').datepicker({    // bootstrap 4/ fontawesome compatible datepicker from https://gijgo.com/datepicker
    uiLibrary: 'bootstrap4',
    iconsLibrary: 'fontawesome',
    showOtherMonths: true,
    selectOtherMonths: true,
    format: 'dd mmmm, yyyy'
});

Which is the proper way for it ?

Thanks!

via Chebli Mohamed