OpenWeatherAPI - time data type

Hey guys ! I’m working on this weather app challenge using the openWeather API and there’s a field in the response that I’m confused about using: the “times”. The description for sunset time, for example, says “Sunset time, Unix, UTC”, and the JSON responde is: “sunset”: 1618333901. So my question is how to use this data, I think its probably the timeZone object, but I’m not sure how to use it.

Thank you !!!