I have been searching but haven't found out how to change it. I understand the time in the browser is UTC based and when a feature is edited or created in the field the auto populated time and date are ahead by 4 hours. Where do I edit this UTC or where in ArcMap or ArcGIS Online do I change the default time to represent EST? Any help would be great!
What kind of layer are you using? A hosted feature service?
ArcGIS Online stores data in UTC. So any data you upload is assumed to be in UTC. When viewed in a browser, the browser will adjust the time to local time.
See if these posts help.
http://forums.arcgis.com/threads/34299-Web-Map-shows-wrong-quot-beach-sampling-date-quot-in-popup-window
http://forums.arcgis.com/threads/67212-With-popups-from-CSV-upload-Date-gets-bogus-time-stamp-Time-is-missing?highlight=utc
Mike