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+<?php
+
+namespace OldSabre\HTTP;
+
+/**
+ * HTTP utility methods
+ *
+ * @copyright Copyright (C) 2007-2015 fruux GmbH (https://fruux.com/).
+ * @author Evert Pot (http://evertpot.com/)
+ * @author Paul Voegler
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Util {
+
+ /**
+ * Parses a RFC2616-compatible date string
+ *
+ * This method returns false if the date is invalid
+ *
+ * @param string $dateHeader
+ * @return bool|DateTime
+ */
+ static function parseHTTPDate($dateHeader) {
+
+ //RFC 2616 section 3.3.1 Full Date
+ //Only the format is checked, valid ranges are checked by strtotime below
+ $month = '(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)';
+ $weekday = '(Monday|Tuesday|Wednesday|Thursday|Friday|Saturday|Sunday)';
+ $wkday = '(Mon|Tue|Wed|Thu|Fri|Sat|Sun)';
+ $time = '[0-2]\d(\:[0-5]\d){2}';
+ $date3 = $month . ' ([1-3]\d| \d)';
+ $date2 = '[0-3]\d\-' . $month . '\-\d\d';
+ //4-digit year cannot begin with 0 - unix timestamp begins in 1970
+ $date1 = '[0-3]\d ' . $month . ' [1-9]\d{3}';
+
+ //ANSI C's asctime() format
+ //4-digit year cannot begin with 0 - unix timestamp begins in 1970
+ $asctime_date = $wkday . ' ' . $date3 . ' ' . $time . ' [1-9]\d{3}';
+ //RFC 850, obsoleted by RFC 1036
+ $rfc850_date = $weekday . ', ' . $date2 . ' ' . $time . ' GMT';
+ //RFC 822, updated by RFC 1123
+ $rfc1123_date = $wkday . ', ' . $date1 . ' ' . $time . ' GMT';
+ //allowed date formats by RFC 2616
+ $HTTP_date = "($rfc1123_date|$rfc850_date|$asctime_date)";
+
+ //allow for space around the string and strip it
+ $dateHeader = trim($dateHeader, ' ');
+ if (!preg_match('/^' . $HTTP_date . '$/', $dateHeader))
+ return false;
+
+ //append implicit GMT timezone to ANSI C time format
+ if (strpos($dateHeader, ' GMT') === false)
+ $dateHeader .= ' GMT';
+
+
+ $realDate = strtotime($dateHeader);
+ //strtotime can return -1 or false in case of error
+ if ($realDate !== false && $realDate >= 0)
+ return new \DateTime('@' . $realDate, new \DateTimeZone('UTC'));
+
+ }
+
+ /**
+ * Transforms a DateTime object to HTTP's most common date format.
+ *
+ * We're serializing it as the RFC 1123 date, which, for HTTP must be
+ * specified as GMT.
+ *
+ * @param \DateTime $dateTime
+ * @return string
+ */
+ static function toHTTPDate(\DateTime $dateTime) {
+
+ // We need to clone it, as we don't want to affect the existing
+ // DateTime.
+ $dateTime = clone $dateTime;
+ $dateTime->setTimeZone(new \DateTimeZone('GMT'));
+ return $dateTime->format('D, d M Y H:i:s \G\M\T');
+
+ }
+
+}

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