diff --git a/mysql-test/main/func_time.result b/mysql-test/main/func_time.result
index 8dcb7e36fcd..4b134388ce8 100644
--- a/mysql-test/main/func_time.result
+++ b/mysql-test/main/func_time.result
@@ -3140,7 +3140,7 @@ def					EXTRACT(YEAR_MONTH FROM a)	3	6	6	Y	32896	0	63
 def					EXTRACT(QUARTER FROM a)	3	2	1	Y	32896	0	63
 def					EXTRACT(MONTH FROM a)	3	2	2	Y	32896	0	63
 def					EXTRACT(WEEK FROM a)	3	2	2	Y	32896	0	63
-def					EXTRACT(DAY FROM a)	3	2	2	Y	32896	0	63
+def					EXTRACT(DAY FROM a)	3	3	2	Y	32896	0	63
 def					EXTRACT(DAY_HOUR FROM a)	3	5	4	Y	32896	0	63
 def					EXTRACT(DAY_MINUTE FROM a)	3	7	6	Y	32896	0	63
 def					EXTRACT(DAY_SECOND FROM a)	3	9	8	Y	32896	0	63
@@ -3230,7 +3230,7 @@ t2	CREATE TABLE `t2` (
   `EXTRACT(QUARTER FROM a)` int(2) DEFAULT NULL,
   `EXTRACT(MONTH FROM a)` int(2) DEFAULT NULL,
   `EXTRACT(WEEK FROM a)` int(2) DEFAULT NULL,
-  `EXTRACT(DAY FROM a)` int(2) DEFAULT NULL,
+  `EXTRACT(DAY FROM a)` int(3) DEFAULT NULL,
   `EXTRACT(DAY_HOUR FROM a)` int(5) DEFAULT NULL,
   `EXTRACT(DAY_MINUTE FROM a)` int(7) DEFAULT NULL,
   `EXTRACT(DAY_SECOND FROM a)` int(9) DEFAULT NULL,
@@ -3279,7 +3279,7 @@ def					EXTRACT(YEAR_MONTH FROM a)	3	6	1	Y	32896	0	63
 def					EXTRACT(QUARTER FROM a)	3	2	1	Y	32896	0	63
 def					EXTRACT(MONTH FROM a)	3	2	1	Y	32896	0	63
 def					EXTRACT(WEEK FROM a)	3	2	9	Y	32896	0	63
-def					EXTRACT(DAY FROM a)	3	2	2	Y	32896	0	63
+def					EXTRACT(DAY FROM a)	3	3	3	Y	32896	0	63
 def					EXTRACT(DAY_HOUR FROM a)	3	5	5	Y	32896	0	63
 def					EXTRACT(DAY_MINUTE FROM a)	3	7	7	Y	32896	0	63
 def					EXTRACT(DAY_SECOND FROM a)	3	9	9	Y	32896	0	63
@@ -3300,7 +3300,7 @@ EXTRACT(YEAR_MONTH FROM a)	0
 EXTRACT(QUARTER FROM a)	0
 EXTRACT(MONTH FROM a)	0
 EXTRACT(WEEK FROM a)	613566757
-EXTRACT(DAY FROM a)	34
+EXTRACT(DAY FROM a)	-34
 EXTRACT(DAY_HOUR FROM a)	-3422
 EXTRACT(DAY_MINUTE FROM a)	-342259
 EXTRACT(DAY_SECOND FROM a)	-34225959
@@ -3366,7 +3366,7 @@ EXTRACT(YEAR_MONTH FROM a)	0
 EXTRACT(QUARTER FROM a)	0
 EXTRACT(MONTH FROM a)	0
 EXTRACT(WEEK FROM a)	613566757
-EXTRACT(DAY FROM a)	34
+EXTRACT(DAY FROM a)	-34
 EXTRACT(DAY_HOUR FROM a)	-3422
 EXTRACT(DAY_MINUTE FROM a)	-342259
 EXTRACT(DAY_SECOND FROM a)	-34225959
@@ -3411,7 +3411,7 @@ t2	CREATE TABLE `t2` (
   `EXTRACT(QUARTER FROM a)` int(2) DEFAULT NULL,
   `EXTRACT(MONTH FROM a)` int(2) DEFAULT NULL,
   `EXTRACT(WEEK FROM a)` int(2) DEFAULT NULL,
-  `EXTRACT(DAY FROM a)` int(2) DEFAULT NULL,
+  `EXTRACT(DAY FROM a)` int(3) DEFAULT NULL,
   `EXTRACT(DAY_HOUR FROM a)` int(5) DEFAULT NULL,
   `EXTRACT(DAY_MINUTE FROM a)` int(7) DEFAULT NULL,
   `EXTRACT(DAY_SECOND FROM a)` int(9) DEFAULT NULL,
@@ -6113,3 +6113,45 @@ NULL	NULL
 Warnings:
 Warning	1292	Truncated incorrect time value: '18446744073709551615-01'
 Warning	1292	Truncated incorrect time value: '18446744073709551616-01'
+#
+# MDEV-17434 EXTRACT(DAY FROM negative_time) returns wrong result
+#
+CREATE TABLE t1 (a TIME(6));
+INSERT INTO t1 VALUES ('-24:10:10.10');
+SELECT
+EXTRACT(MINUTE FROM a),
+EXTRACT(SECOND FROM a),
+EXTRACT(MICROSECOND FROM a),
+EXTRACT(DAY FROM a),
+EXTRACT(DAY_HOUR FROM a),
+EXTRACT(DAY_MINUTE FROM a),
+EXTRACT(DAY_SECOND FROM a),
+EXTRACT(DAY_MICROSECOND FROM a)
+FROM t1;
+EXTRACT(MINUTE FROM a)	EXTRACT(SECOND FROM a)	EXTRACT(MICROSECOND FROM a)	EXTRACT(DAY FROM a)	EXTRACT(DAY_HOUR FROM a)	EXTRACT(DAY_MINUTE FROM a)	EXTRACT(DAY_SECOND FROM a)	EXTRACT(DAY_MICROSECOND FROM a)
+-10	-10	-100000	-1	-100	-10010	-1001010	-1001010100000
+CREATE TABLE t2 AS
+SELECT
+EXTRACT(MINUTE FROM a),
+EXTRACT(SECOND FROM a),
+EXTRACT(MICROSECOND FROM a),
+EXTRACT(DAY FROM a),
+EXTRACT(DAY_HOUR FROM a),
+EXTRACT(DAY_MINUTE FROM a),
+EXTRACT(DAY_SECOND FROM a),
+EXTRACT(DAY_MICROSECOND FROM a)
+FROM t1;
+SHOW CREATE TABLE t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `EXTRACT(MINUTE FROM a)` int(3) DEFAULT NULL,
+  `EXTRACT(SECOND FROM a)` int(3) DEFAULT NULL,
+  `EXTRACT(MICROSECOND FROM a)` int(7) DEFAULT NULL,
+  `EXTRACT(DAY FROM a)` int(3) DEFAULT NULL,
+  `EXTRACT(DAY_HOUR FROM a)` int(5) DEFAULT NULL,
+  `EXTRACT(DAY_MINUTE FROM a)` int(7) DEFAULT NULL,
+  `EXTRACT(DAY_SECOND FROM a)` int(9) DEFAULT NULL,
+  `EXTRACT(DAY_MICROSECOND FROM a)` bigint(15) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t2;
+DROP TABLE t1;
diff --git a/mysql-test/main/func_time.test b/mysql-test/main/func_time.test
index da00ff0eb45..69fd12448eb 100644
--- a/mysql-test/main/func_time.test
+++ b/mysql-test/main/func_time.test
@@ -3014,3 +3014,34 @@ SELECT
 
 SELECT TIME('42949672955959-01'), TIME('42949672965959-01');
 SELECT TIME('18446744073709551615-01'),  TIME('18446744073709551616-01');
+
+--echo #
+--echo # MDEV-17434 EXTRACT(DAY FROM negative_time) returns wrong result
+--echo #
+
+CREATE TABLE t1 (a TIME(6));
+INSERT INTO t1 VALUES ('-24:10:10.10');
+SELECT
+  EXTRACT(MINUTE FROM a),
+  EXTRACT(SECOND FROM a),
+  EXTRACT(MICROSECOND FROM a),
+  EXTRACT(DAY FROM a),
+  EXTRACT(DAY_HOUR FROM a),
+  EXTRACT(DAY_MINUTE FROM a),
+  EXTRACT(DAY_SECOND FROM a),
+  EXTRACT(DAY_MICROSECOND FROM a)
+FROM t1;
+CREATE TABLE t2 AS
+SELECT
+  EXTRACT(MINUTE FROM a),
+  EXTRACT(SECOND FROM a),
+  EXTRACT(MICROSECOND FROM a),
+  EXTRACT(DAY FROM a),
+  EXTRACT(DAY_HOUR FROM a),
+  EXTRACT(DAY_MINUTE FROM a),
+  EXTRACT(DAY_SECOND FROM a),
+  EXTRACT(DAY_MICROSECOND FROM a)
+FROM t1;
+SHOW CREATE TABLE t2;
+DROP TABLE t2;
+DROP TABLE t1;
diff --git a/sql/item_timefunc.cc b/sql/item_timefunc.cc
index 2fc5869d762..317495d354e 100644
--- a/sql/item_timefunc.cc
+++ b/sql/item_timefunc.cc
@@ -2098,7 +2098,7 @@ bool Item_extract::fix_length_and_dec()
   case INTERVAL_QUARTER:          set_date_length(2); break; // 1..4
   case INTERVAL_MONTH:            set_date_length(2); break; // MM
   case INTERVAL_WEEK:             set_date_length(2); break; // 0..52
-  case INTERVAL_DAY:              set_date_length(2); break; // DD
+  case INTERVAL_DAY:              set_day_length(2); break; // DD
   case INTERVAL_DAY_HOUR:         set_time_length(4); break; // DDhh
   case INTERVAL_DAY_MINUTE:       set_time_length(6); break; // DDhhmm
   case INTERVAL_DAY_SECOND:       set_time_length(8); break; // DDhhmmss
@@ -2148,7 +2148,7 @@ longlong Item_extract::val_int()
     week_format= current_thd->variables.default_week_format;
     return calc_week(&ltime, week_mode(week_format), &year);
   }
-  case INTERVAL_DAY:		return ltime.day;
+  case INTERVAL_DAY:		return ltime.day * neg;
   case INTERVAL_DAY_HOUR:	return (long) (ltime.day*100L+ltime.hour)*neg;
   case INTERVAL_DAY_MINUTE:	return (long) (ltime.day*10000L+
 					       ltime.hour*100L+
diff --git a/sql/item_timefunc.h b/sql/item_timefunc.h
index c1e77eae5bc..59031c69c6a 100644
--- a/sql/item_timefunc.h
+++ b/sql/item_timefunc.h
@@ -978,6 +978,11 @@ class Item_extract :public Item_int_func
     max_length= length; //QQ: see above
     date_value= true;
   }
+  void set_day_length(uint32 length)
+  {
+    max_length= length + 1/*sign*/; // e.g. '-24:00:00' -> -1
+    date_value= true;
+  }
   void set_time_length(uint32 length)
   {
     max_length= length + 1/*sign*/;