diff --git a/patterns/grok-patterns b/patterns/grok-patterns
index 37c70487..63dead12 100755
--- a/patterns/grok-patterns
+++ b/patterns/grok-patterns
@@ -68,7 +68,7 @@ ISO8601_SECOND (?:%{SECOND}|60)
 TIMESTAMP_ISO8601 %{YEAR}-%{MONTHNUM}-%{MONTHDAY}[T ]%{HOUR}:?%{MINUTE}(?::?%{SECOND})?%{ISO8601_TIMEZONE}?
 DATE %{DATE_US}|%{DATE_EU}
 DATESTAMP %{DATE}[- ]%{TIME}
-TZ (?:[PMCE][SD]T|UTC)
+TZ (?:[PMCE][SD]T|UTC|CEST|CET)
 DATESTAMP_RFC822 %{DAY} %{MONTH} %{MONTHDAY} %{YEAR} %{TIME} %{TZ}
 DATESTAMP_RFC2822 %{DAY}, %{MONTHDAY} %{MONTH} %{YEAR} %{TIME} %{ISO8601_TIMEZONE}
 DATESTAMP_OTHER %{DAY} %{MONTH} %{MONTHDAY} %{TIME} %{TZ} %{YEAR}
diff --git a/spec/patterns/core_spec.rb b/spec/patterns/core_spec.rb
index b85f6e09..e94f9e4e 100644
--- a/spec/patterns/core_spec.rb
+++ b/spec/patterns/core_spec.rb
@@ -3,4 +3,23 @@
 require 'logstash/patterns/core'
 
 describe LogStash::Patterns::Core do
+  describe "Dates with time zone are correctly interpreted" do
+    config <<-CONFIG
+      filter {
+        grok {
+          match => [ "message",  "%{DATESTAMP_RFC822:stimestamp}" ]
+          singles => true
+        }
+      }
+    CONFIG
+    sample "Tue Jan 01 2013 04:51:39 CEST" do
+      insist { subject["stimestamp"] }== "Tue Jan 01 2013 04:51:39 CEST"
+    end
+    sample "Tue Jan 01 2013 04:51:39 CET" do
+      insist { subject["stimestamp"] }== "Tue Jan 01 2013 04:51:39 CET"
+      end
+    sample "Tue Jan 01 2013 04:51:39 UTC" do
+      insist { subject["stimestamp"] }== "Tue Jan 01 2013 04:51:39 UTC"
+    end
+  end
 end