diff --git a/src/test/regress/expected/timestamp.out b/src/test/regress/expected/timestamp.out
index bde6d786ae6..fff3cf08c17 100644
--- a/src/test/regress/expected/timestamp.out
+++ b/src/test/regress/expected/timestamp.out
@@ -1012,6 +1012,13 @@ SELECT d1 as "timestamp",
  Mon Jan 01 17:32:01 2001    |       200 |        21 |          3 |   2451912 |    978370321
 (65 rows)
 
+-- value near upper bound uses special case in code
+SELECT date_part('epoch', '294270-01-01 00:00:00'::timestamp);
+   date_part   
+---------------
+ 9224097091200
+(1 row)
+
 -- TO_CHAR()
 SELECT to_char(d1, 'DAY Day day DY Dy dy MONTH Month month RM MON Mon mon')
    FROM TIMESTAMP_TBL;
diff --git a/src/test/regress/expected/timestamptz.out b/src/test/regress/expected/timestamptz.out
index 752333f0b00..ff070080731 100644
--- a/src/test/regress/expected/timestamptz.out
+++ b/src/test/regress/expected/timestamptz.out
@@ -1189,6 +1189,13 @@ SELECT d1 as timestamptz,
  Mon Jan 01 17:32:01 2001 PST    |   -28800 |            -8 |               0
 (66 rows)
 
+-- value near upper bound uses special case in code
+SELECT date_part('epoch', '294270-01-01 00:00:00+00'::timestamptz);
+   date_part   
+---------------
+ 9224097091200
+(1 row)
+
 -- TO_CHAR()
 SELECT to_char(d1, 'DAY Day day DY Dy dy MONTH Month month RM MON Mon mon')
    FROM TIMESTAMPTZ_TBL;
diff --git a/src/test/regress/sql/timestamp.sql b/src/test/regress/sql/timestamp.sql
index 458a16b5c61..ed03d7c2187 100644
--- a/src/test/regress/sql/timestamp.sql
+++ b/src/test/regress/sql/timestamp.sql
@@ -261,6 +261,9 @@ SELECT d1 as "timestamp",
    date_part( 'epoch', d1) AS epoch
    FROM TIMESTAMP_TBL;
 
+-- value near upper bound uses special case in code
+SELECT date_part('epoch', '294270-01-01 00:00:00'::timestamp);
+
 -- TO_CHAR()
 SELECT to_char(d1, 'DAY Day day DY Dy dy MONTH Month month RM MON Mon mon')
    FROM TIMESTAMP_TBL;
diff --git a/src/test/regress/sql/timestamptz.sql b/src/test/regress/sql/timestamptz.sql
index d21a8a4dff0..fd1bf50a9c1 100644
--- a/src/test/regress/sql/timestamptz.sql
+++ b/src/test/regress/sql/timestamptz.sql
@@ -275,6 +275,9 @@ SELECT d1 as timestamptz,
    date_part( 'timezone_minute', d1) AS timezone_minute
    FROM TIMESTAMPTZ_TBL;
 
+-- value near upper bound uses special case in code
+SELECT date_part('epoch', '294270-01-01 00:00:00+00'::timestamptz);
+
 -- TO_CHAR()
 SELECT to_char(d1, 'DAY Day day DY Dy dy MONTH Month month RM MON Mon mon')
    FROM TIMESTAMPTZ_TBL;