How to convert UNIX time before 1970 to date format in MySQL?

A possible workaround would be to have a constant handy corresponding to the seconds in a certain number of years (preferrably a multiple of 4). You could add this constant, translate the time and then subtract the number of years chosen.

Example: choose 40 years.

Determine the constant:

MySQL [files]> select adddate(from_unixtime(0), interval 40 year);+---------------------------------------------+| adddate(from_unixtime(0), interval 40 year) |+---------------------------------------------+| 2010-01-01 01:00:00                         |+---------------------------------------------+1 row in set (0.09 sec)MySQL [files]> select unix_timestamp(adddate(from_unixtime(0), interval 40 year));+-------------------------------------------------------------+| unix_timestamp(adddate(from_unixtime(0), interval 40 year)) |+-------------------------------------------------------------+|                                                  1262304000 |+-------------------------------------------------------------+1 row in set (0.09 sec)

Now you can every unix timestamp x between 1930 and 20xx and use it.

select subdate(from_unixtime(x+1262304000), interval 40 year);

With your example -769338000, you get

MySQL [files]> select subdate(from_unixtime(-769338000+1262304000), interval 40 year);+-----------------------------------------------------------------+| subdate(from_unixtime(-769338000+1262304000), interval 40 year) |+-----------------------------------------------------------------+| 1945-08-15 17:00:00                                             |+-----------------------------------------------------------------+1 row in set (0.09 sec)

I found a new way:

converting to MySQL date:

SELECT DATE_ADD(FROM_UNIXTIME(0), interval YOURTIMESTAMPHERE second);

converting your epoch to a date string:

SELECT DATE_FORMAT(DATE_ADD(FROM_UNIXTIME(0), interval YOURTIMESTAMPHERE second), '%Y-%m-%d');

And back

SELECT TIMESTAMPDIFF(second,FROM_UNIXTIME(0),'1960-01-01 00:00:00' );

source:http://www.epochconverter.com/programming/mysql-from-unixtime.php#negavtiveEpoch

SELECT DATE_ADD(CAST('1970-01-01 00:00:00' AS DATETIME), INTERVAL `time_created` SECOND) FROM `member`