In table design view for the table, define a field (DateCreated for example) with type Date and set its default value to "= Now()". That will place a the current datetime on each new record at the time it is created.
For the update of a record, you will need to explicitly set a "DateUpdated" field's value every time you do an update.
In SQL that would be
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UPDATE tbl SET DateUpdated = Now(), ...
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In Code
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Dim rs As Recordset
' Open the recordset
rs![DateUpdated] = Now()
... Other Code ...
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If you are updating via bound controls then you will need to trap the "BeforeUpdate" event and set the value there.