3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
f<?php $dt = new DateTime('first Monday of this month'); echo $dt->format('W');
based on FiXOG
Output for 5.3.0 - 5.4.32, 5.4.42 - 5.4.44, 5.6.28, 7.0.14 - 7.1.0
f32
Output for 5.5.24, 5.5.35, 5.6.21, 7.0.6
f18
Output for 5.5.25 - 5.5.30, 5.5.34, 5.6.8 - 5.6.14, 5.6.20, 7.0.5
f14
Output for 5.5.31 - 5.5.33, 5.6.15 - 5.6.19, 7.0.0 - 7.0.4
f10
Output for 5.4.45
f37
Output for 5.4.41
f23
Output for 5.4.39 - 5.4.40
f19
Output for 5.4.36 - 5.4.38
f06
Output for 5.4.34 - 5.4.35
f45
Output for 5.2.0 - 5.2.17
f Fatal error: Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (first Monday of this month) at position 13 (o): The timezone could not be found in the database' in /in/O159M:3 Stack trace: #0 /in/O159M(3): DateTime->__construct('first Monday of...') #1 {main} thrown in /in/O159M on line 3
Process exited with code 255.
Output for 5.0.0 - 5.1.6
f Fatal error: Class 'DateTime' not found in /in/O159M on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.9
f Fatal error: Cannot instantiate non-existent class: datetime in /in/O159M on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
f Fatal error: Cannot instantiate non-existent class: datetime in /in/O159M on line 3