jQuery DatePicker Min Max dates
maxDate :- Sets the maximum date that can be selected. Accepts a date object or a relative number. For example: +7, or a string such as +6m.
minDate :- Sets the minimum date that can be selected. Accepts a number, date object, or string.
$(document).ready(function() {
$("#date").datepicker({
minDate: -3,
maxDate: "1w"
});
});
Refer:-set Minimum and maximum date to jquery datepicker
$(function() {
$( "#datepicker" ).datepicker({
changeYear: true,
minDate: '-3M',
maxDate: '+28D',
});
});
JSFiddle Demo
UPDATE
You can calculate tour max and min valid dates from the default date, then assign it to the date picker.
var expdisp = $("#expdisp").attr("value");
$("#expirydate" ).datepicker({
showOn: "button",
buttonImage: "images/calendar.gif",
buttonImageOnly: true,
dateFormat: "dd/mm/yy",
defaultDate: expdisp,
showOtherMonths: true,
selectOtherMonths: true,
changeMonth: true,
changeYear: true,
minDate: '-3M',
maxDate: '+28D',
});
Update Demo