getOffset() == $offset_sec) // getOffset() includes eventual daylight saving offset return $time_zone_id; } return false; } if (isset($_GET['timezoneoffset'])) { // Store timezonename in a session variable $timezonename = tz_offset_to_name($_GET['timezoneoffset']); if ($timezonename !== false) $_SESSION['timezonename'] = $timezonename; else $_SESSION['timezonename'] = 'UTC'; // Force getting timezoneoffset from browser with javascript every 10 minutes $_SESSION['timezonename_discard_after'] = time() + 600; } ?>