Converting negative values from FROM_UNIXTIME

Question

I have been trying to convert Date of birth from my DB into DATE FORMat but i am facing the problem of there are some negative values in DOB fields which when i check from o

Answer 1

From DATETIME to unix timestamp:

SELECT TIMESTAMPDIFF(SECOND, FROM_UNIXTIME(0), '1956-12-24 01:06:49');

From timestamp to DATETIME:

SELECT DATE_ADD(convert_tz(FROM_UNIXTIME(0), @@session.time_zone,'+00:00'), INTERVAL -410914391 SECOND);