Patch by Zarafa <http://www.zarafa.com/> - fixes dates in headers which use a timezone definition, instead
of a numeric timezone offset.

--- libvmime-0.7.1/src/dateTime.cpp					2005-04-23 11:02:48.000000000 +0200
+++ libvmime-0.7.1/src/dateTime.cpp.timezone-name			2009-01-08 10:51:39.000000000 +0100
@@ -423,7 +423,7 @@
 				zone[zoneLength++] = *p;
 				++p;
 			}
-			while (zoneLength < 3 && p < pend && parserHelpers::isDigit(*p));
+			while (zoneLength < 3 && p < pend);
 
 			switch (zone[0])
 			{
@@ -487,6 +487,8 @@
 
 				break;
 			}
+			case 'g':
+			case 'G':
 			case 'u':
 			case 'U':
 			{