The following is an example of using UpdatedBy and UpdatedDate properties to capture the current Windows user and current date.

 

Here the  UpdatedBy is defined as a textbox and UpdatedDate is defined as a date.

In addition to enabling the Read Only option to prevent unwanted editing, the initial values for UpdatedBy are set as follows:

Value Type = expressionEvaluator

Value = system.environment.username()

Likewise, UpdatedDate property is set to Read Only with the following initial values:

Value Type = dateRegionalShort

Value = system.Date

communities.bentley.com/.../UpdateDate-and-UpdatedBy.zip

A sample project is attached to help get you started.