http://trentrichardson.com/examples/timepicker
On the options tab there are plenty of stuff to change.
You should also check the official jquery ui datepicker API page:
http://api.jqueryui.com/datepicker
The modifications must be done on the widget instantiation on the JS files of the app located in the assets directory.
$('#slider_example_4').datetimepicker({ controlType: 'select', timeFormat: 'hh:mm tt' });
this._defaults = { // Global defaults for all the datetime picker instances
showButtonPanel: true,
timeOnly: false,
.... ...
controlType: 'slider', <=== change this to ==> controlType: 'select',
...
parse: 'strict',
afterInject: null
};
$.extend(this._defaults, this.regional['']);...