how to post datepicker value in to text box

how to post datepicker value into text box.
conditions
1,default date with time in text box
2,if datepicker selected that value to be in textbox.

Code:

datepicker
**********
<input id="datepic" class="form-control search-query" name="valdate" type="text"
value="<?php echo isset($_POST['valdate']) ? $_POST['valdate'] : '' ?>"  >

input field
************
<?php $edate=strtotime($_POST['valdate']);
 $edate=date("Y-m-d H:i:ss",$edate); ?>

<input type="text" name="valudate" value="<?php echo $edate ;?>"
value="<?php echo isset($_POST['valdate']) ? $_POST['valdate'] : date('Y-m-d') ?>" />

what wrong in my query.
it return 1970-01-01 05:30:0000
how to solve this?

One of these days you will learn how to use Google Search.

How to add DatePicker when i click on text box?

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