ReferenceError: $ is not defined

I have this error message ReferenceError: $ is not defined
This is my header.

<link href="css/global-style.css" rel="stylesheet" type="text/css" media="screen">
<link rel="stylesheet" type="text/css" media="screen" href="css/datepicker3.css">
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="assets/bootstrap/js/bootstrap.min.js"></script>
<script type="text/javascript" src="js/bootstrap-datepicker.js"></script>

Following is my JavaScript code

<script type="text/javascript">
$('#sandbox-container .input-daterange').datepicker({
    startDate: "today",
    calendarWeeks: true,
    todayHighlight: true
});
</script>

Following is the HTML

<div class="col-md-12" id="sandbox-container">
    <label>Project Duration</label>
    <div class="input-daterange input-group" id="datepicker">
            <input type="text" class="input-md form-control" name="start" />
            <span class="input-group-addon">to</span>
            <input type="text" class="input-md form-control" name="end" />
    </div>
</div>

I want to show datepicker on the input tag.
I am using Bootstrap V3.1.
I am using this datepicker.

Answer

Add jQuery library before your script which uses $ or jQuery so that $ can be identified in scripts.

<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>

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Answer