Just set dateFormat to an empty string dateFormat: ''
$('#field-start_t_a').datetimepicker({
dateFormat: '',
timeFormat: 'hh:mm tt'
});
(this is a little strange that you only want to set time from the datetimepicker, because you can also do $('#field-start_t_a').timepicker();
and only the time options show)
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…