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SELECT ((UNIX_TIMESTAMP(field_with_date_in_table) - UNIX_TIMESTAMP(NOW()))/3600) AS hoursleft
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SELECT TIMESTAMPDIFF(DAY,NOW(),'2012-01-01') AS DAY,
TIMESTAMPDIFF(HOUR,NOW(),'2012-01-01')-TIMESTAMPDIFF(DAY,NOW(),'2012-01-01')*24 AS HOUR,
TIMESTAMPDIFF(MINUTE,NOW(),'2012-01-01')-TIMESTAMPDIFF(HOUR,NOW(),'2012-01-01')*60 AS MINUTE;