diff --git a/dba/davical.sql b/dba/davical.sql
index 50fb4907..fa8280cc 100644
--- a/dba/davical.sql
+++ b/dba/davical.sql
@@ -167,8 +167,8 @@ CREATE TABLE calendar_item (
   completed TIMESTAMP WITH TIME ZONE,
   dav_id INT8 UNIQUE,
   collection_id INT8 REFERENCES collection(collection_id) ON UPDATE CASCADE ON DELETE CASCADE DEFERRABLE,
-  first_instance_start TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
-  last_instance_end    TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
+  first_instance_start TIMESTAMP WITH TIME ZONE DEFAULT NULL,
+  last_instance_end    TIMESTAMP WITH TIME ZONE DEFAULT NULL,
   
   -- Cascade updates / deletes from the caldav_data table
   CONSTRAINT caldav_exists FOREIGN KEY ( user_no, dav_name )
@@ -489,4 +489,4 @@ CREATE SEQUENCE metrics_count_delticket;
 CREATE SEQUENCE metrics_count_bind;
 CREATE SEQUENCE metrics_count_unknown;
 
-SELECT new_db_revision(1,3,2, 'Luty' );
+SELECT new_db_revision(1,3,3, 'Marzec' );
diff --git a/dba/patches/1.3.3.sql b/dba/patches/1.3.3.sql
new file mode 100644
index 00000000..466743f7
--- /dev/null
+++ b/dba/patches/1.3.3.sql
@@ -0,0 +1,23 @@
+
+-- Notable enhancement:	change first_instance_start and last_instance_end to be timezone-aware
+
+BEGIN;
+SELECT check_db_revision(1,3,2);
+
+ALTER TABLE calendar_item
+  ALTER COLUMN first_instance_start
+  TYPE TIMESTAMP WITH TIME ZONE
+  -- I don't believe the column has ever been populated, but if it has, we want
+  -- to throw away that data anyway because we don't know its timezone
+  USING NULL::timestamptz;
+
+ALTER TABLE calendar_item
+  ALTER COLUMN last_instance_end
+  TYPE TIMESTAMP WITH TIME ZONE
+  USING NULL::timestamptz; -- As above
+
+-- http://blogs.transparent.com/polish/names-of-the-months-and-their-meaning/
+SELECT new_db_revision(1,3,3, 'Marzec' );
+
+COMMIT;
+ROLLBACK;
diff --git a/testing/tests/regression-suite/Really-Upgrade-Database.result b/testing/tests/regression-suite/Really-Upgrade-Database.result
index 379ba8dc..299acd5c 100644
--- a/testing/tests/regression-suite/Really-Upgrade-Database.result
+++ b/testing/tests/regression-suite/Really-Upgrade-Database.result
@@ -1,4 +1,4 @@
-The database is version XX currently at revision 1.3.2.
+The database is version XX currently at revision 1.3.3.
 No patches were applied.
 Supported locales updated.
 Updated view: dav_principal.sql applied.