This can be easily achieved if you redefine the SaveChanges implementation in a partial class of you context. The code should something like this:
var changes =
var updates = changes.GetUpdates<IEnitity>();
u.ModifiedOn = DateTime.Now;
Here I rely on the fact that all entities in the model inherit from the IEntity interface where the ModifiedOn property is defined. You can define the interface in the Designer or as code if you are using fluent mapping. The code above will update the ModifiedOn property for each updated record that inherits from the IEntity interface.
I hope this helps. Should you have any additional questions do not hesitate to get back to us.
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