Grafana Prometheus display Epoch Time

Hey all, I have a Prometheus metric bgpPeerFsmEstablishedTime which indicates how long in seconds a BGP session has been in the established state. Using the Prometheus query time() - bgpPeerFsmEstablishedTime, I get the epoch time. How can I display this in Grafana as a date/time? I’ve tried using the Datetime ISO unit (stat panel). However when refreshing this value changes every time when it shouldn’t.