Eastern time is showing as GMT-4 both in openfire control interface and on this site.
I am positive Eastern time is GMT-5 (I spent many years in a job for which knowing EST vs MST was very important).
http://wwp.greenwichmeantime.com/time-zone/usa/eastern-time/convert/
EST EDT GMT
01:00 1.00am 02:00 2.00am 06:00 6.00am