Converting unix timestamp stored as bigint to readable date time
We are storing the timestamp as a bigint. In the SQL query trying to convert this timestamp to date time.
have used the function FROM_UNIXTIME but it just returns a NULL value.
Answer Answered by Ian Gilfillan in this comment.
Assuming you meant to store a timestamp equivalent to 04/02/47737, this is due to the Unix timestamp limit. See https://en.wikipedia.org/wiki/Year_2038_problem
Currently this is not scheduled to be fixed in MariaDB - see MDEV-341.
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