Unix time stamp conversion is different in Mysql and Oracle

Question

Unix time stamp conversion giving tow different result in mysql and oracle

select FROM_UNIXTIME(1387444958) from dual;

Output :2013-12-19 1

Answer 1

Unix timestamp is seconds from 1970-01-01 00:00:00 UTC which is actually 1970-01-01 01:00:00 in your local timezone (or the timezone where your MySQL server is located). Looks like FROM_UNIXTIME takes this into account.

For Oracle you can use this function:

FUNCTION UnixTime2Timestamp(UnixTime IN NUMBER) RETURN TIMESTAMP IS
BEGIN
    RETURN (TIMESTAMP '1970-01-01 00:00:00 UTC' + UnixTime * INTERVAL '1' SECOND) AT LOCAL;
END UnixTime2Timestamp;

I assume if you like to get UTC time in MySQL then you have to run

select 
   CONVERT_TZ(FROM_UNIXTIME(1387444958),'{your local timezone}','UTC') 
from dual;