Chatbot: Capturing the user leads

i have connected my Voiceflow to googlesheet with a post request to send the Complain, Email and name. It's working but i want to also be able to capture the current date and time. How am I supposed to do that since I tried to add a JavaScript code for creating a time/date variable yet i can't seem to find the variable to add it to the post request. please have a look at the pics for better context.