diff --git a/src/backend/utils/adt/datetime.c b/src/backend/utils/adt/datetime.c
index 972fcd26a2..1f8b0183f3 100644
--- a/src/backend/utils/adt/datetime.c
+++ b/src/backend/utils/adt/datetime.c
@@ -2280,6 +2280,9 @@ DecodeTimeOnly(char **field, int *ftype, int nf,
 			GetCurrentDateTime(tmp);
 		else
 		{
+			/* a date has to be fully specified */
+			if ((fmask & DTK_DATE_M) != DTK_DATE_M)
+				return DTERR_BAD_FORMAT;
 			tmp->tm_year = tm->tm_year;
 			tmp->tm_mon = tm->tm_mon;
 			tmp->tm_mday = tm->tm_mday;
@@ -2307,6 +2310,9 @@ DecodeTimeOnly(char **field, int *ftype, int nf,
 			GetCurrentDateTime(tmp);
 		else
 		{
+			/* a date has to be fully specified */
+			if ((fmask & DTK_DATE_M) != DTK_DATE_M)
+				return DTERR_BAD_FORMAT;
 			tmp->tm_year = tm->tm_year;
 			tmp->tm_mon = tm->tm_mon;
 			tmp->tm_mday = tm->tm_mday;
diff --git a/src/test/regress/expected/timetz.out b/src/test/regress/expected/timetz.out
index 33ff8e18c9..a25f468cbb 100644
--- a/src/test/regress/expected/timetz.out
+++ b/src/test/regress/expected/timetz.out
@@ -19,6 +19,16 @@ INSERT INTO TIMETZ_TBL VALUES ('15:36:39 America/New_York');
 ERROR:  invalid input syntax for type time with time zone: "15:36:39 America/New_York"
 LINE 1: INSERT INTO TIMETZ_TBL VALUES ('15:36:39 America/New_York');
                                        ^
+-- this should fail (the time specification is invalid)
+INSERT INTO TIMETZ_TBL VALUES ('15:36:39 m2');
+ERROR:  invalid input syntax for type time with time zone: "15:36:39 m2"
+LINE 1: INSERT INTO TIMETZ_TBL VALUES ('15:36:39 m2');
+                                       ^
+-- this should fail too (the same with a dynamic timezone abbreviation)
+INSERT INTO TIMETZ_TBL VALUES ('15:36:39 MSK m2');
+ERROR:  invalid input syntax for type time with time zone: "15:36:39 MSK m2"
+LINE 1: INSERT INTO TIMETZ_TBL VALUES ('15:36:39 MSK m2');
+                                       ^
 SELECT f1 AS "Time TZ" FROM TIMETZ_TBL;
     Time TZ     
 ----------------
diff --git a/src/test/regress/sql/timetz.sql b/src/test/regress/sql/timetz.sql
index c41686a5e2..58c4b6e1bc 100644
--- a/src/test/regress/sql/timetz.sql
+++ b/src/test/regress/sql/timetz.sql
@@ -19,6 +19,11 @@ INSERT INTO TIMETZ_TBL VALUES ('2003-03-07 15:36:39 America/New_York');
 INSERT INTO TIMETZ_TBL VALUES ('2003-07-07 15:36:39 America/New_York');
 -- this should fail (the timezone offset is not known)
 INSERT INTO TIMETZ_TBL VALUES ('15:36:39 America/New_York');
+-- this should fail (the time specification is invalid)
+INSERT INTO TIMETZ_TBL VALUES ('15:36:39 m2');
+-- this should fail too (the same with a dynamic timezone abbreviation)
+INSERT INTO TIMETZ_TBL VALUES ('15:36:39 MSK m2');
+
 
 SELECT f1 AS "Time TZ" FROM TIMETZ_TBL;