diff -r 9b79ce8f9829 -r 67a8d95375b6 whois/parser.py
--- a/whois/parser.py	Mon Jun 27 20:25:08 2016 +0100
+++ b/whois/parser.py	Mon Jun 27 20:33:43 2016 +0100
@@ -126,7 +126,7 @@
                 values = []
                 for value in re.findall(regex, self.text, re.IGNORECASE):
                     value = value.strip()
-                    if value and isinstance(value, basestring):
+                    if value and isinstance(value, basestring) and not value.isdigit():
                         # try casting to date format
                         value = cast_date(
                             value,