Disable datetimepicker past date & time

To disable the past time, you should use minDateTime. Update your code like this, 

$(document).ready(function(){
	$('.date-future').datetimepicker({
		minDate:0,
		step:15,
		minDateTime: new Date(),
		maxDate:false,
		closeOnDateSelect: false,
		closeOnTimeSelect: true,
		formatTime:"h:i A",
		format:'Y-m-d H:i'
	});
});