Thanks for the reply but my requirement is, users will be entering the details in module(sender) and sending it to another module(receiver) so while entering the details, system should capture(automatically) who the sender is. First of all is it achievable? Give the screen shot for your reference.
I dont think there is a formula which returns the current user. So is the current date/time.
Usually other applications does these automatically when a record is created, "created by" and "created on". So far what i understood is there is no easy way to achieve this. You can mock the system date by keeping a field coming through integration everyday/every hour and importing this into the target module when an action is triggered, this is tedious, not straight forward.