diff --git a/mysql-test/r/func_date_add.result b/mysql-test/r/func_date_add.result
index e8fbba786a43f..0258267b5ec5e 100644
--- a/mysql-test/r/func_date_add.result
+++ b/mysql-test/r/func_date_add.result
@@ -102,3 +102,54 @@ select * from t1 where case a when adddate( '2012-12-12', 7 ) then true end;
 a
 drop table t1;
 End of 5.5 tests
+#
+# Start of 10.1 tests
+#
+#
+# MDEV-14452 Precision in INTERVAL xxx DAY_MICROSECOND parsed wrong?
+#
+SELECT
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5' DAY_MICROSECOND) c1,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50' DAY_MICROSECOND) c2,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500' DAY_MICROSECOND) c3,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000' DAY_MICROSECOND) c4,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000' DAY_MICROSECOND) c5,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500000' DAY_MICROSECOND) c6,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000000' DAY_MICROSECOND) c7,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000000' DAY_MICROSECOND) c8,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500000000' DAY_MICROSECOND) c9,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000000000' DAY_MICROSECOND) c10,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000000000' DAY_MICROSECOND) c11,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500000000000' DAY_MICROSECOND) c12,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000000000000' DAY_MICROSECOND) c13,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000000000000' DAY_MICROSECOND) c14,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500000000000000' DAY_MICROSECOND) c15,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000000000000000' DAY_MICROSECOND) c16,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000000000000000' DAY_MICROSECOND) c17,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500000000000000000' DAY_MICROSECOND) c18,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000000000000000000' DAY_MICROSECOND) c19,
+DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000000000000000000' DAY_MICROSECOND) c20
+;
+c1	1000-01-01 00:00:01.500000
+c2	1000-01-01 00:00:01.500000
+c3	1000-01-01 00:00:01.500000
+c4	1000-01-01 00:00:01.500000
+c5	1000-01-01 00:00:01.500000
+c6	1000-01-01 00:00:01.500000
+c7	1000-01-01 00:00:01.500000
+c8	1000-01-01 00:00:01.500000
+c9	1000-01-01 00:00:01.500000
+c10	1000-01-01 00:00:01.500000
+c11	1000-01-01 00:00:01.500000
+c12	1000-01-01 00:00:01.500000
+c13	1000-01-01 00:00:01.500000
+c14	1000-01-01 00:00:01.500000
+c15	1000-01-01 00:00:01.500000
+c16	1000-01-01 00:00:01.500000
+c17	1000-01-01 00:00:01.500000
+c18	1000-01-01 00:00:01.500000
+c19	1000-01-01 00:00:01.500000
+c20	NULL
+#
+# End of 10.1 tests
+#
diff --git a/mysql-test/t/func_date_add.test b/mysql-test/t/func_date_add.test
index 5f27978347c44..e7e2b96f0ebd5 100644
--- a/mysql-test/t/func_date_add.test
+++ b/mysql-test/t/func_date_add.test
@@ -100,3 +100,40 @@ drop table t1;
 
 --echo End of 5.5 tests
 
+--echo #
+--echo # Start of 10.1 tests
+--echo #
+
+--echo #
+--echo # MDEV-14452 Precision in INTERVAL xxx DAY_MICROSECOND parsed wrong?
+--echo #
+
+--vertical_results
+SELECT
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5' DAY_MICROSECOND) c1,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50' DAY_MICROSECOND) c2,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500' DAY_MICROSECOND) c3,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000' DAY_MICROSECOND) c4,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000' DAY_MICROSECOND) c5,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500000' DAY_MICROSECOND) c6,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000000' DAY_MICROSECOND) c7,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000000' DAY_MICROSECOND) c8,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500000000' DAY_MICROSECOND) c9,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000000000' DAY_MICROSECOND) c10,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000000000' DAY_MICROSECOND) c11,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500000000000' DAY_MICROSECOND) c12,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000000000000' DAY_MICROSECOND) c13,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000000000000' DAY_MICROSECOND) c14,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500000000000000' DAY_MICROSECOND) c15,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000000000000000' DAY_MICROSECOND) c16,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000000000000000' DAY_MICROSECOND) c17,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.500000000000000000' DAY_MICROSECOND) c18,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.5000000000000000000' DAY_MICROSECOND) c19,
+  DATE_ADD('1000-01-01 00:00:00', INTERVAL '0 00:00:01.50000000000000000000' DAY_MICROSECOND) c20
+;
+--horizontal_results
+
+
+--echo #
+--echo # End of 10.1 tests
+--echo #
diff --git a/sql/item_timefunc.cc b/sql/item_timefunc.cc
index 4a94c3a5f89dd..d7506026c628b 100644
--- a/sql/item_timefunc.cc
+++ b/sql/item_timefunc.cc
@@ -702,7 +702,7 @@ static bool get_interval_info(const char *str,uint length,CHARSET_INFO *cs,
 {
   const char *end=str+length;
   uint i;
-  long msec_length= 0;
+  long field_length= 0;
 
   while (str != end && !my_isdigit(cs,*str))
     str++;
@@ -713,7 +713,8 @@ static bool get_interval_info(const char *str,uint length,CHARSET_INFO *cs,
     const char *start= str;
     for (value= 0; str != end && my_isdigit(cs, *str); str++)
       value= value*10 + *str - '0';
-    msec_length= 6 - (str - start);
+    if ((field_length= str - start) >= 20)
+      return true;
     values[i]= value;
     while (str != end && !my_isdigit(cs,*str))
       str++;
@@ -728,8 +729,13 @@ static bool get_interval_info(const char *str,uint length,CHARSET_INFO *cs,
     }
   }
 
-  if (transform_msec && msec_length > 0)
-    values[count - 1] *= (long) log_10_int[msec_length];
+  if (transform_msec && field_length > 0)
+  {
+    if (field_length < 6)
+      values[count - 1] *= (long) log_10_int[6 - field_length];
+    else if (field_length > 6)
+      values[count - 1] /= (long) log_10_int[field_length - 6];
+  }
 
   return (str != end);
 }