<?php
date_default_timezone_set('UTC'); //should be set in your script or in your php.ini
$date = new DateTime('FIRST DAY OF PREVIOUS MONTH');
echo $date->format('Y-m-d'), PHP_EOL;
Fatal error: Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (FIRST DAY OF PREVIOUS MONTH) at position 10 (O): The timezone could not be found in the database' in /in/9rn4J:3
Stack trace:
#0 /in/9rn4J(3): DateTime->__construct('FIRST DAY OF PR...')
#1 {main}
thrown in /in/9rn4J on line 3
Process exited with code 255.
Output for 5.1.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/9rn4J on line 3
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Fatal error: Call to undefined function date_default_timezone_set() in /in/9rn4J on line 2
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: date_default_timezone_set() in /in/9rn4J on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4
Fatal error: Call to undefined function: date_default_timezone_set() in /in/9rn4J on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: date_default_timezone_set() in /in/9rn4J on line 2