Keep Value after using POST PHP

Dear Expert,

I want to keep value with INPUT Element. When click submit, the INPUT Element keep last value. when first load, it get value from current date in code from php server.

<form role="form" method="post" id="myForm">
    <div class="col-sm-2">
        <input id="daterange" class="form-control" type="text" name="daterange" value="<?php
        echo Date("Y-m-d");
        echo " - ";
        echo Date("Y-m-d")
        ?>"  style="cursor: pointer"/>
    </div> 
    <div class="form groups col-sm-1">
        <input type="submit" name="submit" value="view" class="btn btn-primary btn-block">
    </div>
</form>

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