Success callback

[mistris]

$('#timezone-image').timezonePicker({
            pin: '.timezone-pin',
            fillColor: 'FFCCCC',
            target: '#edit-date-default-timezone',
            changeHandler: function (timezoneName, countryName, offset) {
                console.log(timezoneName, countryName, offset);
            }
        });

changeHandler is not working. How can I call a function on success callback (after selecting timezone)?