<?php
$d = new DateTime('2011-01-15 00:00:00');
$d2 = $d->modify('first day of this month');
echo Date('t', 2);
//$d2 = $d2->modify('last day of this month');
//$d3 = $d2->modify('last day of previous month');
var_dump($d2);
Warning: DateTime::modify(): Failed to parse time string (first day of this month) at position 10 (o): The timezone could not be found in the database in /in/nN6QU on line 5
31bool(false)
Output for 5.2.0 - 5.2.12
31NULL
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/nN6QU on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/nN6QU on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/nN6QU on line 3