- mktime: documentation ( source)
- date: documentation ( source)
<?php
$to_date = date('Y-m-t' . ' 00:00:00', mktime(0, 0, 0, date("m") , date("d"), date("Y")));//
$from_date = date('Y-m-01' . ' 00:00:00', mktime(0, 0, 0, date("m") , date("d"), date("Y")));//
echo $to_date;
echo "<br/>";
echo $from_date;