$dateStart = new DateTime('28.06.2019');
$now = new DateTime();
$number = 1000;
$minix = 1;
$maxix = 3;
$numbers = mt_rand($minix * 2, $maxix * 2) / 2;
$diff = $dateStart->diff($now)->format('%R%a');
echo $numbers * $diff + $number;<div style="border-bottom: 1px solid #e8e7f6">
<div class="row justify-content-center">
<div class="col-md-8">
<h4 style="color: #2d3138" class="text-center">Поле</h4>
<div style="margin-top:40px; margin-bottom: 20px" class="reviews-error">
<form method="post" enctype="multipart/form-data">
<input type="hidden" name="Rating" value="5" />
<div class="row">
<div class="col-md-12">
<div style="margin-bottom: 20px;width:100%;" class="form-input">
<textarea style="height: auto;min-width: 100%;max-height: 300px" class="textarea" rows="3" name="Text" placeholder="Ваше сообщение"></textarea>
</div>
</div>
</div>
<div class="row">
<div class="col-md-6">
<div class="input-file-container">
</div>
</div>
<div class="col-md-6">
<a class="button-style button-style_blue button-style_medium" onclick="clear();" data-toggle="modal" data-target="#calculator" id="Calc1" href="#">Очистить</a>
</div>
</div>
</form>
</div>
</div>
</div>
</div>function clear() {
document.textAreaElem.value = "";
}