Bug#19408 Test 'func_time' fails on Windows x64

- The setting of "ENV{'TZ'}" doesn't affect the timezone
  used by MySQL Server on Windows.
- Explicitly set timezone to "+03:00" in test case before
  doing the calculatiosn to check that there is three hours
  difference between utc and local time.
(Magnus' fix)

mysql-test/r/func_time.result

 drop table if exists t1,t2,t3;
+set time_zone="+03:00";
 select from_days(to_days("960101")),to_days(960201)-to_days("19960101"),to_days(date_add(curdate(), interval 1 day))-to_days(curdate()),weekday("1997-11-29");
 from_days(to_days("960101"))	to_days(960201)-to_days("19960101")	to_days(date_add(curdate(), interval 1 day))-to_days(curdate())	weekday("1997-11-29")
 1996-01-01	31	1	5
@@ -945,3 +946,4 @@ id	day	id	day
 1	2005-06-01	3	2005-07-15
 3	2005-07-01	3	2005-07-15
 DROP TABLE t1,t2;
+set time_zone= @@global.time_zone;

mysql-test/t/func_time.test

@@ -5,6 +5,9 @@
 drop table if exists t1,t2,t3;
 --enable_warnings
 
+# Set timezone to GMT-3, to make it possible to use "interval 3 hour"
+set time_zone="+03:00";
+
 select from_days(to_days("960101")),to_days(960201)-to_days("19960101"),to_days(date_add(curdate(), interval 1 day))-to_days(curdate()),weekday("1997-11-29");
 select period_add("9602",-12),period_diff(199505,"9404") ;
 
@@ -335,6 +338,7 @@ select last_day("1997-12-1")+0.0;
 
 # Test SAPDB UTC_% functions. This part is TZ dependant (It is supposed that
 # TZ variable set to GMT-3
+
 select strcmp(date_sub(localtimestamp(), interval 3 hour), utc_timestamp())=0;
 select strcmp(date_format(date_sub(localtimestamp(), interval 3 hour),"%T"), utc_time())=0;
 select strcmp(date_format(date_sub(localtimestamp(), interval 3 hour),"%Y-%m-%d"), utc_date())=0;
@@ -513,3 +517,6 @@ SELECT * FROM t1, t2
 DROP TABLE t1,t2;
 
 # End of 5.0 tests
+
+# Restore timezone to default
+set time_zone= @@global.time_zone;