Change created/modified to unix time

Hi,

I currently make use of the created and modified fields throughout my application but being datetime fields, performing searches/comparisons isn't as fast as they could be if unix timestamps were used.

I realise there may be the excuse that formatting would be required as unix timestamps are unreadable, but this is also the case with the current setup as how many people use YYYY-MM-DD HH:MM:SS when displaying dates? it's usually DD-MM-YYYY or MM-DD-YYYY.

What does everyone else think?

Is there a way to convert the current created/modified fields to UNIX timestamps with current CakePHP?

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