diff --git a/src/test/regress/expected/timestamptz.out b/src/test/regress/expected/timestamptz.out
index e5a2130..0a3fd16 100644
--- a/src/test/regress/expected/timestamptz.out
+++ b/src/test/regress/expected/timestamptz.out
@@ -1675,6 +1675,35 @@ SELECT '' AS to_char_11, to_char(d1, 'FMIYYY FMIYY FMIY FMI FMIW FMIDDD FMID')
             | 2001 1 1 1 1 1 1
 (66 rows)
 
+SET timezone = '-04:30';
+SELECT to_char(now(), 'OF');
+ to_char 
+---------
+ +04:30
+(1 row)
+
+SET timezone = '04:30';
+SELECT to_char(now(), 'OF');
+ to_char 
+---------
+ -04:30
+(1 row)
+
+SET timezone = '00:00';
+SELECT to_char(now(), 'OF');
+ to_char 
+---------
+ +00
+(1 row)
+
+SET timezone = '-13:00';
+SELECT to_char(now(), 'OF');
+ to_char 
+---------
+ +13
+(1 row)
+
+RESET timezone;
 CREATE TABLE TIMESTAMPTZ_TST (a int , b timestamptz);
 -- Test year field value with len > 4
 INSERT INTO TIMESTAMPTZ_TST VALUES(1, 'Sat Mar 12 23:58:48 1000 IST');
diff --git a/src/test/regress/sql/timestamptz.sql b/src/test/regress/sql/timestamptz.sql
index f4b455e..dae7235 100644
--- a/src/test/regress/sql/timestamptz.sql
+++ b/src/test/regress/sql/timestamptz.sql
@@ -241,6 +241,16 @@ SELECT '' AS to_char_10, to_char(d1, 'IYYY IYY IY I IW IDDD ID')
 SELECT '' AS to_char_11, to_char(d1, 'FMIYYY FMIYY FMIY FMI FMIW FMIDDD FMID')
    FROM TIMESTAMPTZ_TBL;
 
+SET timezone = '-04:30';
+SELECT to_char(now(), 'OF');
+SET timezone = '04:30';
+SELECT to_char(now(), 'OF');
+SET timezone = '00:00';
+SELECT to_char(now(), 'OF');
+SET timezone = '-13:00';
+SELECT to_char(now(), 'OF');
+RESET timezone;
+
 CREATE TABLE TIMESTAMPTZ_TST (a int , b timestamptz);
 
 -- Test year field value with len > 4