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run code in 200+ php & hhvm versions
Bugs & Features
<?php $date = new DateTime('now'); $firstOfMonth = $date->modify('start of month')->format(DATE_ISO8601); $lastOfMonth = $date->modify('last day of month')->format(DATE_ISO8601); var_dump(array($firstOfMonth, $lastOfMonth));

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for Typed properties v2
Warning: DateTime::modify(): Failed to parse time string (start of month) at position 0 (s): The timezone could not be found in the database in /in/LmlUL on line 5 Fatal error: Uncaught Error: Call to a member function format() on boolean in /in/LmlUL:5 Stack trace: #0 {main} thrown in /in/LmlUL on line 5
Output for Array change keys
Warning: DateTime::modify(): Failed to parse time string (start of month) at position 0 (s): The timezone could not be found in the database in /in/LmlUL on line 5 Fatal error: Uncaught Error: Call to a member function format() on boolean in /in/LmlUL:5 Stack trace: #0 {main} thrown in /in/LmlUL on line 5
Output for Lexical anon
Warning: DateTime::modify(): Failed to parse time string (start of month) at position 0 (s): The timezone could not be found in the database in /in/LmlUL on line 5 Catchable fatal error: Call to a member function format() on boolean in /in/LmlUL on line 5

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page