Every reminder send via the Process hold the same Date as SendDate. This way it is not possible to determine when the reminder has been send.
By Default a reminder is been created with a static Send Date. This date usually reflect the date this reminder has been added to the Process.
To set the Send Date to the date/time the reminder got created by the process.
- Open the reminder in the Process
- Right click the Send Date Field and choose calculation
- Add the following calculation into the editor and close the editor and reminder
import System static def GetAttributeValue(Reminder): Value = DateTime.UtcNow return Value
No every time a new reminder gets created by the process the Send Date will be set to current time of creation.