jQuery/javascript/bootstrap - Working with datepicker, combining two scripts, StartDate/EndDate

I have two sets of code, both which work on their own, but I'm really struggling to combine the two.
What I'm trying to do is control start date / end date entries into respective textboxes with datepicker.
When the start date is selected, the date picker disables dates before that selected date when the other text box is clicked.
Also, only days up until the next Sunday (from the selected start date) can be selected as an end date.

So this code works to disable any previous dates for the endDate textbox.

  var dateFormat = "mm/dd/yy";
  var from = $(".start").datepicker({
    changeMonth: true,
    numberOfMonths: 1

  }).on("change", function () {
    to.datepicker("option", "minDate", getDate(this));
  });

  var to = $(".end").datepicker({
    changeMonth: true,
    numberOfMonths: 1
  }).on("change", function() {
    from.datepicker("option", "maxDate", getDate(this));
  });

  function getDate(element) {
    var date;
    try {
      date = $.datepicker.parseDate(dateFormat, element.value);
    } catch (error) {
      date = null;
    }

    return date;
  }

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And this code works to only allow dates selected until the next Sunday:

<script>
var dateFormat = "mm/dd/yy";
$(document).ready(function(){
  var from = $("#StartDate").datepicker({
    changeMonth: true,
    dateFormat: dateFormat,
    numberOfMonths: 1,
    onSelect: function(dt, inst){
      var fromDt = $(this).datepicker("getDate");
      var nextSunday = new Date(fromDt.getTime());
      nextSunday.setDate(nextSunday.getDate() + 7 - fromDt.getDay());
());

      to.datepicker("option", "minDate", dt);
      to.datepicker("option", "maxDate", nextSunday);
    }
  });

  var to = $("#EndDate").datepicker({
    changeMonth: true,
    dateFormat: dateFormat,
    numberOfMonths: 1,
    onSelect: function(dt, inst){
      from.datepicker("option", "maxDate", dt);
    }
  });
});
</script>

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I need to combine the two, or have a better way to do it. I just can't seem to get them to play together.
Mike MillerSoftware EngineerAsked:
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Leonidas DosasCommented:
Can you post and the HTML code?
Mike MillerSoftware EngineerAuthor Commented:
It's CHTML. What are you looking for specifically?
Mike MillerSoftware EngineerAuthor Commented:
I commented everything out of one of the scripts and just started putting it back in piece by piece and this seems to work...

    <script>
var dateFormat = "mm/dd/yy";
$(document).ready(function(){
  var from = $(".start").datepicker({
    changeMonth: true,
   dateFormat: dateFormat,
    numberOfMonths: 1,
    onSelect: function(dt, inst){
      var fromDt = $(this).datepicker("getDate");
      var nextSunday = new Date();
      nextSunday.setDate(fromDt.getDate() + 7 - fromDt.getDay());

      to.datepicker("option", "minDate", dt);
      to.datepicker("option", "maxDate", nextSunday);
    }
  });

  var to = $(".end").datepicker({
    changeMonth: true,
    dateFormat: dateFormat,
    numberOfMonths: 1,
    //onSelect: function(dt, inst){
  //    from.datepicker("option", "maxDate", dt);
    //}
  });
});
    </script>
    <script>
        $(document).ready(function() {
            $('.datepicker').on('change', function () {
                var string1 = $('.start').val();
                var string2 = $('.end').val();
                if (string1 !== "" && string2 !== "") {
                    //do some validation to make sure they are properly formatted dates
                    //then...
                    var dateStart = new Date(string1);
                    var dateEnd = new Date(string2);
                    var days = parseInt((dateEnd - dateStart) / (24 * 3600 * 1000));
                    days = days + 1
                    var hours = days * 8;
                    if (days > 0) {
                        var ddl = $('#mySelect');
                        ddl.empty();
                        for (var i = 1; i <= hours; i++) {
                            var option = new Option(i, i);
                            ddl.append(option);
                        }
                    }
                }
            });
            });
    </script>

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Mike MillerSoftware EngineerAuthor Commented:
Mine was the only one provided
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