#19409: Test 'func_timestamp' fails on Windows x64

- The setting of "ENV{'TZ'}" doesn't affect the timezone
  used by MySQL Server on Windows.
- Explicitly set timezone in test cases before doing UTC/localtime
  conversions so tests produce deterministic results

mysql-test/r/func_timestamp.result

 drop table if exists t1;
+set time_zone="+03:00";
 create table t1 (Zeit time, Tag tinyint not null, Monat tinyint not null,
 Jahr smallint not null, index(Tag), index(Monat), index(Jahr) );
 insert into t1 values ("09:26:00",16,9,1998),("09:26:00",16,9,1998);
@@ -9,3 +10,4 @@ Date	Unix
 1998-9-16 09:26:00	905927160
 1998-9-16 09:26:00	905927160
 drop table t1;
+set time_zone= @@global.time_zone;

mysql-test/r/type_timestamp.result

 drop table if exists t1,t2;
+set time_zone="+03:00";
 CREATE TABLE t1 (a int, t timestamp);
 CREATE TABLE t2 (a int, t datetime);
 SET TIMESTAMP=1234;
@@ -491,3 +492,4 @@ a	b	c
 5	NULL	2001-09-09 04:46:59
 6	NULL	2006-06-06 06:06:06
 drop table t1;
+set time_zone= @@global.time_zone;

mysql-test/t/func_timestamp.test

@@ -6,6 +6,9 @@
 drop table if exists t1;
 --enable_warnings
 
+# Set timezone to GMT-3, to make it possible to use "interval 3 hour"
+set time_zone="+03:00";
+
 create table t1 (Zeit time, Tag tinyint not null, Monat tinyint not null,
 Jahr smallint not null, index(Tag), index(Monat), index(Jahr) );
 insert into t1 values ("09:26:00",16,9,1998),("09:26:00",16,9,1998);
@@ -15,3 +18,6 @@ FROM t1;
 drop table t1;
 
 # End of 4.1 tests
+
+# Restore timezone to default
+set time_zone= @@global.time_zone;

mysql-test/t/type_timestamp.test

@@ -6,6 +6,9 @@
 drop table if exists t1,t2;
 --enable_warnings
 
+# Set timezone to GMT-3, to make it possible to use "interval 3 hour"
+set time_zone="+03:00";
+
 CREATE TABLE t1 (a int, t timestamp);
 CREATE TABLE t2 (a int, t datetime);
 SET TIMESTAMP=1234;
@@ -322,3 +325,6 @@ select * from t1;
 drop table t1;
 
 # End of 4.1 tests
+
+# Restore timezone to default
+set time_zone= @@global.time_zone;