jQuery DatePicker with today as maxDate
$(".datepicker").datepicker({maxDate: '0'});This will set the maxDate to +0 days from the current date (i.e. today). See:
http://api.jqueryui.com/datepicker/#option-maxDate
$( ".selector" ).datepicker( "option", "maxDate", '+0m +0w' );
If you're using bootstrap 3 date time picker, try this:
$('.selector').datetimepicker({ maxDate: $.now() });