How to disable dates previous and upcoming to specific date in datetimepicker?

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jQuery

DateTime

I'm using jquery datetime picker.

I want to disable date selection of dates previous to specific date.

for e.g.

if my date is 13/03/2016,
calendar starts from this date and enddate will be current date i.e. 13/05/2016.

user should not be able to select date before 13/03/2016 and after 13/05/2016.

What I have tried:

var t = $("#preDate").val();
 var jsDate = new Date(t);

var time = new Date().getTime();
var currentdate = new Date(time);

var datetime1= "-"+jsDate.getDate()+"/"+(jsDate.getMonth()+1) +"/"+jsDate.getFullYear();
var datetime2 = currentdate.getDate()+"/"+(currentdate.getMonth()+1) +"/"+currentdate.getFullYear();

 $("#myDtPicker").datetimepicker({
                minTime:0,
                minDate:datetime1,
                maxDate:datetime2,
                startDate:datetime1,
                endDate:datetime2,                
                formatTime: 'H:i',
                formatDate: 'd/m/Y',
            });

but it's not working..

What's wrong with the code?