I developed an application using Arduino NANO that required a RTC. You can either buy something to physically add to the NANO configuration or use the RTC widget that BLYNK has. Yes, I play with BLYNK. Obviously, you save money with the widget. Wouldn’t it be nice to have a similar Cayenne widget?
As far as I know Cayenne doesn’t have anything like that, but there is a generic Arduino library that you can use to get the current time to use in your sketch. See this link