Fix for #16327: invalid TIMESTAMP values retrieved

mysql-test/r/func_time.result:
  Fix for #16327: invalid TIMESTAMP values retrieved
    - test result
mysql-test/t/func_time.test:
  Fix for #16327: invalid TIMESTAMP values retrieved
    - test case
sql/field.cc:
  Fix for #16327: invalid TIMESTAMP values retrieved
    - let 1969 as well

mysql-test/r/func_time.result

@@ -630,3 +630,10 @@ select monthname(str_to_date(null, '%m')), monthname(str_to_date(null, '%m')),
 monthname(str_to_date(1, '%m')), monthname(str_to_date(0, '%m'));
 monthname(str_to_date(null, '%m'))	monthname(str_to_date(null, '%m'))	monthname(str_to_date(1, '%m'))	monthname(str_to_date(0, '%m'))
 NULL	NULL	January	NULL
+set time_zone='-6:00';
+create table t1(a timestamp);
+insert into t1 values (19691231190001);
+select * from t1;
+a
+1969-12-31 19:00:01
+drop table t1;

mysql-test/t/func_time.test

@@ -322,4 +322,14 @@ select last_day('2005-01-00');
 select monthname(str_to_date(null, '%m')), monthname(str_to_date(null, '%m')),
        monthname(str_to_date(1, '%m')), monthname(str_to_date(0, '%m'));
 
+#
+# Bug #16327: problem with timestamp < 1970
+#
+
+set time_zone='-6:00';
+create table t1(a timestamp);
+insert into t1 values (19691231190001);
+select * from t1;
+drop table t1;
+
 # End of 4.1 tests

sql/field.cc

@@ -3809,7 +3809,7 @@ String *Field_timestamp::val_str(String *val_buffer, String *val_ptr)
   thd->time_zone_used= 1;
 
   temp= time_tmp.year % 100;
-  if (temp < YY_PART_YEAR)
+  if (temp < YY_PART_YEAR - 1)
   {
     *to++= '2';
     *to++= '0';