I have a GeoEvent Service running that populates an attribute field in a feature with the currentTime() every minute. This is fine for features that sit within UTC. I have features that range from UTC-4 to UTC+7. I figured I could have a "Time Difference" attribute with the numeric time difference (in milliseconds perhaps?) and put in a filed calculator to my GeoEvent Service. I have not been successful yet. Any advice would be appreciated.