// Return history operations from the {offset}th, starting from {since}.
$since = \DateTime::createFromFormat(\DateTime::ATOM, $request->getParam('since'));
$offset = $request->getParam('offset');
if (empty($offset)) {
$offset = 0;
// Return history operations from the {offset}th, starting from {since}.
$since = \DateTime::createFromFormat(\DateTime::ATOM, $request->getParam('since'));
$offset = $request->getParam('offset');
if (empty($offset)) {
$offset = 0;