drop table if exists t1, t2;
create table t1 (ts timestamp);
set time_zone='+00:00';
select unix_timestamp(utc_timestamp())-unix_timestamp(current_timestamp());
unix_timestamp(utc_timestamp())-unix_timestamp(current_timestamp())
0
insert into t1 (ts) values ('2003-03-30 02:30:00');
set time_zone='+10:30';
select unix_timestamp(utc_timestamp())-unix_timestamp(current_timestamp());
unix_timestamp(utc_timestamp())-unix_timestamp(current_timestamp())
-37800
insert into t1 (ts) values ('2003-03-30 02:30:00');
set time_zone='-10:00';
select unix_timestamp(utc_timestamp())-unix_timestamp(current_timestamp());
unix_timestamp(utc_timestamp())-unix_timestamp(current_timestamp())
36000
insert into t1 (ts) values ('2003-03-30 02:30:00');
select * from t1;
ts
2003-03-29 16:30:00
2003-03-29 06:00:00
2003-03-30 02:30:00
drop table t1;
select Name from mysql.time_zone_name where Name in 
('UTC','Universal','MET','Europe/Moscow','leap/Europe/Moscow');
Name
Europe/Moscow
leap/Europe/Moscow
MET
Universal
UTC
create table t1 (i int, ts timestamp);
set time_zone='MET';
insert into t1 (i, ts) values
(unix_timestamp('2003-03-01 00:00:00'),'2003-03-01 00:00:00');
insert into t1 (i, ts) values
(unix_timestamp('2003-03-30 01:59:59'),'2003-03-30 01:59:59'),
(unix_timestamp('2003-03-30 02:30:00'),'2003-03-30 02:30:00'),
(unix_timestamp('2003-03-30 03:00:00'),'2003-03-30 03:00:00');
Warnings:
Warning	1299	Invalid TIMESTAMP value in column 'ts' at row 2
insert into t1 (i, ts) values
(unix_timestamp('2003-05-01 00:00:00'),'2003-05-01 00:00:00');
insert into t1 (i, ts) values
(unix_timestamp('2003-10-26 01:00:00'),'2003-10-26 01:00:00'),
(unix_timestamp('2003-10-26 02:00:00'),'2003-10-26 02:00:00'),
(unix_timestamp('2003-10-26 02:59:59'),'2003-10-26 02:59:59'),
(unix_timestamp('2003-10-26 04:00:00'),'2003-10-26 04:00:00'),
(unix_timestamp('2003-10-26 02:59:59'),'2003-10-26 02:59:59');
set time_zone='UTC';
select * from t1;
i	ts
1046473200	2003-02-28 23:00:00
1048985999	2003-03-30 00:59:59
1048986000	2003-03-30 01:00:00
1048986000	2003-03-30 01:00:00
1051740000	2003-04-30 22:00:00
1067122800	2003-10-25 23:00:00
1067126400	2003-10-26 00:00:00
1067129999	2003-10-26 00:59:59
1067137200	2003-10-26 03:00:00
1067129999	2003-10-26 00:59:59
delete from t1;
set time_zone='Europe/Moscow';
insert into t1 (i, ts) values
(unix_timestamp('2004-01-01 00:00:00'),'2004-01-01 00:00:00'),
(unix_timestamp('2004-03-28 02:30:00'),'2004-03-28 02:30:00'),
(unix_timestamp('2004-08-01 00:00:00'),'2003-08-01 00:00:00'),
(unix_timestamp('2004-10-31 02:30:00'),'2004-10-31 02:30:00');
Warnings:
Warning	1299	Invalid TIMESTAMP value in column 'ts' at row 2
select * from t1;
i	ts
1072904400	2004-01-01 00:00:00
1080428400	2004-03-28 03:00:00
1091304000	2003-08-01 00:00:00
1099175400	2004-10-31 02:30:00
delete from t1;
set time_zone='leap/Europe/Moscow';
insert into t1 (i, ts) values
(unix_timestamp('2004-01-01 00:00:00'),'2004-01-01 00:00:00'),
(unix_timestamp('2004-03-28 02:30:00'),'2004-03-28 02:30:00'),
(unix_timestamp('2004-08-01 00:00:00'),'2003-08-01 00:00:00'),
(unix_timestamp('2004-10-31 02:30:00'),'2004-10-31 02:30:00');
Warnings:
Warning	1299	Invalid TIMESTAMP value in column 'ts' at row 2
select * from t1;
i	ts
1072904422	2004-01-01 00:00:00
1080428422	2004-03-28 03:00:00
1091304022	2003-08-01 00:00:00
1099175422	2004-10-31 02:30:00
delete from t1;
insert into t1 (i, ts) values
(unix_timestamp('1981-07-01 03:59:59'),'1981-07-01 03:59:59'),
(unix_timestamp('1981-07-01 04:00:00'),'1981-07-01 04:00:00');
select * from t1;
i	ts
362793608	1981-07-01 03:59:59
362793610	1981-07-01 04:00:00
select from_unixtime(362793609);
from_unixtime(362793609)
1981-07-01 03:59:60
drop table t1;
create table t1 (ts timestamp);
set time_zone='UTC';
insert into t1 values ('0000-00-00 00:00:00'),('1969-12-31 23:59:59'),
('1970-01-01 00:00:00'),('1970-01-01 00:00:01'),
('2037-12-31 23:59:59'),('2038-01-01 00:00:00');
Warnings:
Warning	1264	Data truncated; out of range for column 'ts' at row 2
Warning	1264	Data truncated; out of range for column 'ts' at row 3
Warning	1264	Data truncated; out of range for column 'ts' at row 6
select * from t1;
ts
0000-00-00 00:00:00
0000-00-00 00:00:00
0000-00-00 00:00:00
1970-01-01 00:00:01
2037-12-31 23:59:59
0000-00-00 00:00:00
delete from t1;
set time_zone='MET';
insert into t1 values ('0000-00-00 00:00:00'),('1970-01-01 00:30:00'),
('1970-01-01 01:00:00'),('1970-01-01 01:00:01'),
('2038-01-01 00:59:59'),('2038-01-01 01:00:00');
Warnings:
Warning	1264	Data truncated; out of range for column 'ts' at row 2
Warning	1264	Data truncated; out of range for column 'ts' at row 3
Warning	1264	Data truncated; out of range for column 'ts' at row 6
select * from t1;
ts
0000-00-00 00:00:00
0000-00-00 00:00:00
0000-00-00 00:00:00
1970-01-01 01:00:01
2038-01-01 00:59:59
0000-00-00 00:00:00
delete from t1;
set time_zone='+01:30';
insert into t1 values ('0000-00-00 00:00:00'),('1970-01-01 01:00:00'),
('1970-01-01 01:30:00'),('1970-01-01 01:30:01'),
('2038-01-01 01:29:59'),('2038-01-01 01:30:00');
Warnings:
Warning	1264	Data truncated; out of range for column 'ts' at row 2
Warning	1264	Data truncated; out of range for column 'ts' at row 3
Warning	1264	Data truncated; out of range for column 'ts' at row 6
select * from t1;
ts
0000-00-00 00:00:00
0000-00-00 00:00:00
0000-00-00 00:00:00
1970-01-01 01:30:01
2038-01-01 01:29:59
0000-00-00 00:00:00
drop table t1;
show variables like 'time_zone';
Variable_name	Value
time_zone	+01:30
set time_zone = default;
show variables like 'time_zone';
Variable_name	Value
time_zone	SYSTEM
set time_zone= '0';
ERROR HY000: Unknown or incorrect time zone: '0'
set time_zone= '0:0';
ERROR HY000: Unknown or incorrect time zone: '0:0'
set time_zone= '-20:00';
ERROR HY000: Unknown or incorrect time zone: '-20:00'
set time_zone= '+20:00';
ERROR HY000: Unknown or incorrect time zone: '+20:00'
set time_zone= 'Some/Unknown/Time/Zone';
ERROR HY000: Unknown or incorrect time zone: 'Some/Unknown/Time/Zone'
select convert_tz(now(),'UTC', 'Universal') = now();
convert_tz(now(),'UTC', 'Universal') = now()
1
select convert_tz(now(),'utc', 'UTC') = now();
convert_tz(now(),'utc', 'UTC') = now()
1
select convert_tz('1917-11-07 12:00:00', 'MET', 'UTC');
convert_tz('1917-11-07 12:00:00', 'MET', 'UTC')
1917-11-07 12:00:00
select convert_tz('1970-01-01 01:00:00', 'MET', 'UTC');
convert_tz('1970-01-01 01:00:00', 'MET', 'UTC')
1970-01-01 01:00:00
select convert_tz('1970-01-01 01:00:01', 'MET', 'UTC');
convert_tz('1970-01-01 01:00:01', 'MET', 'UTC')
1970-01-01 00:00:01
select convert_tz('2003-03-01 00:00:00', 'MET', 'UTC');
convert_tz('2003-03-01 00:00:00', 'MET', 'UTC')
2003-02-28 23:00:00
select convert_tz('2003-03-30 01:59:59', 'MET', 'UTC');
convert_tz('2003-03-30 01:59:59', 'MET', 'UTC')
2003-03-30 00:59:59
select convert_tz('2003-03-30 02:30:00', 'MET', 'UTC');
convert_tz('2003-03-30 02:30:00', 'MET', 'UTC')
2003-03-30 01:00:00
select convert_tz('2003-03-30 03:00:00', 'MET', 'UTC');
convert_tz('2003-03-30 03:00:00', 'MET', 'UTC')
2003-03-30 01:00:00
select convert_tz('2003-05-01 00:00:00', 'MET', 'UTC');
convert_tz('2003-05-01 00:00:00', 'MET', 'UTC')
2003-04-30 22:00:00
select convert_tz('2003-10-26 01:00:00', 'MET', 'UTC');
convert_tz('2003-10-26 01:00:00', 'MET', 'UTC')
2003-10-25 23:00:00
select convert_tz('2003-10-26 02:00:00', 'MET', 'UTC');
convert_tz('2003-10-26 02:00:00', 'MET', 'UTC')
2003-10-26 00:00:00
select convert_tz('2003-10-26 02:59:59', 'MET', 'UTC');
convert_tz('2003-10-26 02:59:59', 'MET', 'UTC')
2003-10-26 00:59:59
select convert_tz('2003-10-26 04:00:00', 'MET', 'UTC');
convert_tz('2003-10-26 04:00:00', 'MET', 'UTC')
2003-10-26 03:00:00
select convert_tz('2038-01-01 00:59:59', 'MET', 'UTC');
convert_tz('2038-01-01 00:59:59', 'MET', 'UTC')
2037-12-31 23:59:59
select convert_tz('2038-01-01 01:00:00', 'MET', 'UTC');
convert_tz('2038-01-01 01:00:00', 'MET', 'UTC')
2038-01-01 01:00:00
select convert_tz('2103-01-01 04:00:00', 'MET', 'UTC');
convert_tz('2103-01-01 04:00:00', 'MET', 'UTC')
2103-01-01 04:00:00
create table t1 (tz varchar(3));
insert into t1 (tz) values ('MET'), ('UTC');
select tz, convert_tz('2003-12-31 00:00:00',tz,'UTC'), convert_tz('2003-12-31 00:00:00','UTC',tz) from t1 order by tz;
tz	convert_tz('2003-12-31 00:00:00',tz,'UTC')	convert_tz('2003-12-31 00:00:00','UTC',tz)
MET	2003-12-30 23:00:00	2003-12-31 01:00:00
UTC	2003-12-31 00:00:00	2003-12-31 00:00:00
drop table t1;
select convert_tz('2003-12-31 04:00:00', NULL, 'UTC');
convert_tz('2003-12-31 04:00:00', NULL, 'UTC')
NULL
select convert_tz('2003-12-31 04:00:00', 'SomeNotExistingTimeZone', 'UTC');
convert_tz('2003-12-31 04:00:00', 'SomeNotExistingTimeZone', 'UTC')
NULL
select convert_tz('2003-12-31 04:00:00', 'MET', 'SomeNotExistingTimeZone');
convert_tz('2003-12-31 04:00:00', 'MET', 'SomeNotExistingTimeZone')
NULL
select convert_tz('2003-12-31 04:00:00', 'MET', NULL);
convert_tz('2003-12-31 04:00:00', 'MET', NULL)
NULL
select convert_tz( NULL, 'MET', 'UTC');
convert_tz( NULL, 'MET', 'UTC')
NULL
create table t1 (ts timestamp);
set timestamp=1000000000;
insert into t1 (ts) values (now());
select convert_tz(ts, @@time_zone, 'Japan') from t1;
convert_tz(ts, @@time_zone, 'Japan')
2001-09-09 10:46:40
drop table t1;
select convert_tz('2005-01-14 17:00:00', 'UTC', custTimeZone) from (select 'UTC' as custTimeZone) as tmp;
convert_tz('2005-01-14 17:00:00', 'UTC', custTimeZone)
2005-01-14 17:00:00
create table t1 select convert_tz(NULL, NULL, NULL);
select * from t1;
convert_tz(NULL, NULL, NULL)
NULL
drop table t1;