<script type="text/javascript" charset="utf-8">  
  $(document).ready(function() {
 
    // Identify this question
    var thisQuestion = $('#question{QID}');
 
    // The holidays - format: [month, date, description]
    holidays = [
    [1, 1, 'News Years day'], [2, 16, 'Family Day'], [4, 3, 'Good Friday'],
    [5, 18, 'Victoria Day'], [7, 1, 'Canada Day'], [9, 7, 'Labour Day'],
    [10, 12, 'Thanksgiving'], [12, 25, 'Christmas'], [12, 26, 'Boxing Day']
    ];
 
    // A function to show holidays and disable weekend days in a datepicker 
    function showHolidaysDisableWeekends(date) {
      var thisMonth = date.getMonth();
      var thisDate = date.getDate();
      var thisDay = date.getDay();
      var returnedArr = [true, '']; // Normal day
 
      // Loop through the holidays
      $(holidays).each(function(i, value) {
        if (thisMonth == value[0] - 1 &amp;&amp; thisDate == value[1]) {
          if(thisDay == 0 || thisDay == 6) {
            returnedArr = [false, 'holiday', value[2]+', cannot choose a weekend day']; // Weekend holiday
          }
          else { 
            returnedArr = [true, 'holiday', value[2]]; // Weekday holiday
          }
          return false; // Exit the loop
        }
        else if (thisDay == 0 || thisDay == 6) { 
          returnedArr = [false, '', 'Cannot choose a weekend day']; // Weekend day
        }
      });
      return returnedArr;
    }   
 
    // Apply the new "beforeShowDay" option
    $('input[type="text"]', thisQuestion).datepicker('option', 'beforeShowDay', showHolidaysDisableWeekends);
  });
</script>

.ui-datepicker-calendar td.holiday a,
.ui-datepicker-calendar td.holiday span {
  background: none pink !important;
}

<script type="text/javascript" charset="utf-8">  
  $(document).ready(function() {
 
    // Identify this question
    var thisQuestion = $('#question{QID}');
 
    // No weekends
    $('input[type="text"]', thisQuestion).datepicker('option', 'beforeShowDay', $.datepicker.noWeekends);
  });
</script>

$('input[type="text"]', thisQuestion).datepicker('option', 'beforeShowDay', showHolidaysDisableWeekends).datepicker( "show" );

$('input[type="text"]', thisQuestion).datepicker('option', 'beforeShowDay', showHolidaysDisableWeekends);

<script type="text/javascript" charset="utf-8">
  $(document).ready(function(){  
    // Disable days of week
    $('#answer{SGQ}_datetimepicker').data('DateTimePicker').daysOfWeekDisabled([0,1,5,6]);
  });
</script>