get all of dates ( day ) from a month...

$month = '2015-01';
$start = Carbon::parse($month)->startOfMonth();
$end = Carbon::parse($month)->endOfMonth();

$dates = [];
while ($start->lte($end)) {
     $dates[] = $start->copy();
     $start->addDay();
}

echo "
", print_r($dates), "
";