Need help in display date from MySQL

I have been searching for full day, but could not find a relevant post to a simple problem. I am unable to display a Datetime data from Mysql table to an html5 datetime-local input element. Help will be highly appreciated.

Html element is:

<input type="datetime-local" class="form-control" name="date" id="date" value="<?php echo date('Y-m-d');echo 'T';echo date ('H');echo ':';echo date('i');?>" required="required">

My Controller code is:

$invoice = Purchase::find($id)->toArray();
$items = Purchase::find($id)->items->toArray();
return response()->json(array('invoice'=>$invoice,'items'=>$items));

And Ajax code is:

$('#date').val(data.invoice['date'].toString('Y-m-dTH:i'));

via Chebli Mohamed