Limit the visibility of interface changes to the workflows started after the release date

Question

Hi, 
 I would like to limit the visibility of interface changes to the workflows started after the release date . I am calling the rule below and controlling the visibility. 
 
 My first question is can we use pp!starttime inside the expression rules ? 
 Is there any other way we can control the visiblity ? 
 
 if(
releaseDate < pp!starttime,
true,
false
)

bradc · Accepted Answer

Hi, 
 
Yes, you can do this, however, you will not be able to test your expression or view your interface without replacing pp!starttime with a value. Alternatively, you can add an input for the date time and use that in your expression instead and pass in pp!starttime as a parameter. 
 
There are other possible options such as pm!version if you want to base your logic on the process model version and reference a constant that is specific to each environment that contains the applicable process model version for that environment.