gistfile1.txt

# Determine the starting time of the form item:
starting_time = self.get("my_form")
 
# Determine the current time:
current_time = self.time()
 
# The time it took to complete the form base is the 
# difference score between the two:
my_rt = current_time - starting_time
 
# Set the new variable for future use in the
# GUI (notably, the logger item):
exp.set("my_rt", my_rt)