This may become a bit OT, but here goes:
Use MySQL for this. MySQL has (imho) excellent functions for dealing with misc things, for example date and time. Example:
SELECT UNIX_TIMESTAMP(timestamp) AS epoch FROM extable;
This give you the column "timestamp" from the table extable in epoch-format and call the column 'epoch' in the output.
May I also suggest that you format your date with MySQL? This can easily be done with MySQL's DATE_FORMAT function. Example:
SELECT DATE_FORMAT(timestamp,"%Y-%d-%m %H:%i:%S") AS mydate FROM extable;
This would give you the timestamp-column (in output called mydate) in the format: yyyy-mm-dd HH:MM:SS.
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