diff --git a/Chapter_04/Chapter_04.sql b/Chapter_04/Chapter_04.sql
index 9b2502a..494c2e1 100644
--- a/Chapter_04/Chapter_04.sql
+++ b/Chapter_04/Chapter_04.sql
@@ -57,7 +57,7 @@ CREATE TABLE date_time_types (
 INSERT INTO date_time_types
 VALUES
     ('2022-12-31 01:00 EST','2 days'),
-    ('2022-12-31 01:00 PST','1 month'),
+    ('2022-12-31 01:00 -8','1 month'),
     ('2022-12-31 01:00 Australia/Melbourne','1 century'),
     (now(),'1 week');