Oops, I used the wrong function in my post above. That should have been:

UPDATE w3t_Posts
SET B_Posted = UNIX_TIMESTAMP('2003-06-14 20:05:00')
WHERE B_Number = 123456

FROM_UNIXTIME() is the reverse function - it converts a timestamp into a readable date/time. It would be used for displaying an existing timestamp in the database, e.g.:

SELECT FROM_UNIXTIME(B_Posted)
FROM w3t_Posts
WHERE B_Number = 123456

With that change, it should work ok.

Reference: MySQL Date and Time Functions.

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