is_datestamp('Thu, 18 May 100 10:40:43 +0200 (MET DST)', [958639243, '+0200']);
is_datestamp('Thu, 18 May 2000 10:40:43 +0200', [958639243, '+0200']);
is_datestamp('Tue, 27 Feb 2007 16:23:25 -0060', [1172597005, '-0100']);
+is_datestamp('Wed, 20 Dec 2006 05:32:58 -0420', [1166608378, '-0420']);
+is_datestamp('Wed, 20 Dec 2006 05:32:58 +0420', [1166577178, '+0420']);
+is_datestamp('Thu, 14 Dec 2006 00:20:24 +0480', [1166036424, '+0520']);
+is_datestamp('Thu, 14 Dec 2006 00:20:24 -0480', [1166074824, '-0520']);
+is_datestamp('Mon, 14 Apr 2014 07:59:01 -0007', [1397462761, '-0007']);
done_testing();