<?php
class Foo extends DateTime {
const ATOM = 'Y-m-d';
}
echo (new DateTime('2015-02-01'))->format(DateTime::ATOM), PHP_EOL;
echo (new Foo('2015-02-01'))->format(Foo::ATOM);
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
2015-02-01T00:00:00+01:00
2015-02-01