如何禁用今天jquery中传递的时间？

I'm new in Jquery. Here is my problem. I would like to disable the time passed in today but not affect tomorrow time. For example now is 31/03/2016 3:00pm, user cannot choose the time for 31/03/2016 2:00pm but able to choose time for 01/04/2016 2:00pm

Here is my jquery script code:

var dateTime;
$('#datepicker').datetimepicker({
    timepicker:false,
    format:'Y-m-d',
    formatDate:'Y-m-d',
    minDate: 0, // yesterday is minimum date
    maxDate: false, // and tommorow is maximum date calendar
    onSelect: function() { 
      dateTime = $(this).datetimepicker('getDate').getDate(); 
   }
});
if(dateTime  == new Date().getDate()){
    $('#reserv_time').datetimepicker({
    datepicker:false,
    format:'h:i A',
    step:5,                                          
    minTime: {hour: new Date().getHours(), minute: new Date().getMinutes()}
    })
}
else {
    $('#reserv_time').datetimepicker({
    datepicker:false,
    format:'h:i A',
    step: 5
    })
};      

Here is my php code:

<tr>
<td width="24%">Date</td>
   <td><input type="text" id="datepicker" name="reserv_date" value="<?php echo date('Y-m-d');?>" /></td>
</tr>
<tr>
<td>Time</td>
<td><input type="text" name="reserv_time" id="reserv_time" value="<?php echo date('h:i A');?>"/>

Thanks for help a lot.

Add minTime also,

$('#datepicker').datetimepicker({
    timepicker:false,
    format:'Y-m-d',
    formatDate:'Y-m-d',
    minDate: 0, // yesterday is minimum date
    minTime: 0,  //Added Here
    maxDate: false, // and tommorow is maximum date calendar
    onChangeDateTime : enable,
    onSelect: function() { 
      dateTime = $(this).datetimepicker('getDate').getDate(); 
   }
});



var enable = function(currentDateTime){
        if(currentDateTime > new Date()){
            this.setOptions({
                  minTime:'0:00'
                });
        }
        else{
            this.setOptions({
                  minTime: 0
                });
        }
    };

Thank for everyone to solve this question. I had found the solution.

var dateTime; 
$('#reserv_date').datetimepicker({
    timepicker: false,
    format:'Y-m-d',
    formatDate:'Y-m-d',
    minDate: 0,
    yearStart: 2015,
    maxDate: false
});
$('#reserv_date').on("change",function(){
dateTime = $('#reserv_date').val();
var d = new Date();
var month = d.getMonth()+1;
var day = d.getDate();
var output = d.getFullYear() + '-' + (month<10 ? '0' : '') + month + '-' +
(day<10 ? '0' : '') + day; 
if(dateTime  == output){
    $('#reserv_time').datetimepicker({
    datepicker:false,
    format:'h:i A',
    formatTime:'h:i A',
    step:15,                                             
    minTime: 0
    })
}
else {
    $('#reserv_time').datetimepicker({
    datepicker:false,
    format:'h:i A',
    formatTime:'h:i A',
    step:15,
    minTime: false
    })
}   
});