​

 window.onload = function(event) {

     const options = {

                     datepicker: {

                                   min: "0",

                                   max: "90",

                                 },

                    timepicker: {

                                  increment: true,

                                }  

                    };

    const myDatetimepicker = new mdb.Datetimepicker(document.getElementById('dtp'),options);

 }