timeVsDateTimeTest.php

<?php

class timeVsDateTimeTest extends PHPUnit_Framework_TestCase
{
    public function testTimeVsDateTime()
    {
        $timeZone = "Europe/Madrid";
        ini_set('date.timezone', $timeZone); // otherwise next assertion won't pass.
        date_default_timezone_set($timeZone);
        $maybeUtc = time();

        $this->assertEquals(
            $maybeUtc,
            (new DateTime("@$maybeUtc", new DateTimeZone($timeZone)))->format('U'),
            'this should pass, formatting to U seems to take care of timezone diff'
        );
        $this->assertEquals(
            date('H:i:s', $maybeUtc),
            (new DateTime("@$maybeUtc", new DateTimeZone($timeZone)))->format('H:i:s'),
            'this will not pass, will return different hours.'
        );
    }

}