Need Help on EOModel Auto update of DATE column for DirectToWeb app

I have a DirectToWeb application (with EOModels), where in I have a table
with create_date and modify_date columns.

I need the create_date and modify_date of the table to be automatically
updated, whenever the user tries to create a new record for the table or,
when the user tries to edit an existing record of the table.

Any idea how to achieve this?

Any hints will be very helpful.. 

Thanks a lot in advance,
BLS
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