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CREATE TABLE test (
	day1 DATETIME,
	day2 TIMESTAMP
);
SET SESSION time_zone = 'UTC';
INSERT INTO test VALUES ('2014-12-25 00:00:00', '2014-12-25 00:00:00');
SET SESSION time_zone = 'Asia/Tokyo';
INSERT INTO test VALUES ('2014-12-25 00:00:00', '2014-12-25 00:00:00');
SET SESSION time_zone = 'UTC';
SELECT * FROM test;

-- day1 day2
-- 2014-12-25 00:00:00	2014-12-25 00:00:00
-- 2014-12-25 00:00:00	2014-12-24 15:00:00