+ $this->assertRegExp('/Tue, 10 Mar 2015 11:46:51 \+\d{4}/', $link['pub_iso_date']);
+ $pub = DateTime::createFromFormat(DateTime::RSS, $link['pub_iso_date']);
+ $up = DateTime::createFromFormat(DateTime::ATOM, $link['up_iso_date']);
+ $this->assertEquals($pub, $up);