With the following code:

import React from "react";
import { MDBDateTimepicker,
               MDBRow, 
               MDBContainer,
               MDBCol} from "mdb-react-ui-kit";

function IntervalDateTimePicker(props) {

    function startDateChange(value, date) {
        console.log("startDateChange ", value);
    }

    function startTimeChange(value) {
        console.log("startTimeChange ", value);
    }

    function startDateTimeChange() {
        console.log("startDateTimeChange ");
    }

    function endDateChange(value, date) {
        console.log("endDateChange ", value);
    }
    function endTimeChange(value) {
        console.log("endTimeChange ", value);
    }
    function endDateTimeChange() {
        console.log("endDateTimeChange ");
    }

    return (
        <MDBContainer>
            <MDBRow>
                <MDBCol>
                    <MDBDateTimepicker  id="dpstart"
                                        datepickerOptions={{ onChange: startDateChange }}
                                        timepickerOptions={{ format:'24h', onChange: startTimeChange }}
                                        onChange={startDateTimeChange}/>
                </MDBCol>
                <MDBCol>
                    <MDBDateTimepicker id="dpend" inline
                                       datepickerOptions={{ onChange: endDateChange }}
                                       timepickerOptions={{ format:'24h', onChange: endTimeChange }}
                                       onChange={endDateTimeChange} />
                </MDBCol>
            </MDBRow>
        </MDBContainer>
    );
}

export default IntervalDateTimePicker;

Expected behavior

When change time in one of the two DateTimePicker the associated event handler (startTimeChange, endTimeChange) will be called.

Actual behavior

Thi is true only for the not inlined datetimepicker

Resources (screenshots, code snippets etc.)

In the following images, the console logs generated when changing date and time on both datetimepickers: