What is the proposed idea/solution?

When you add a button to an interface who's action is "Update Record", you can select a user field and set the value to the dynamic data of "Current User", allow for things like a button to approve a record.  You can also set the value of other field types, like a date/datetime.  However, there is no equivalent option to set it to the current time.  Should allow that as it can record the time a button is pressed. 

How does is solve the user problems?

Makes approval workflow examples, or any other update triggered by a button press, more robust by automatically recording the time it was triggered. 

How was this validated?

Created a button on a form interface, set to update record, added a date field and you can only set a fixed datetime value not a dynamic one like "Current date/time"

Who is the target audience?

Anyone using the new forms interface to build record review/approval workflows.