Sunday 8 March 2015 2am local time
until Sunday 1 November 2015 2am local time
see: Daylight-Saving-Time.com for details
USA and Canada Standard Time Date schedules here
Eastern Daylight Time (EDT) is the Daylight Saving Time (DST) of the Eastern Time Zone of the United States of America (USA) and Canada.
During DST the time is shifted forward by 1 hour to EDT; which is 4 hours behind Greenwich Mean Time (GMT-4).
After the Summer months Eastern Time is shifted back by 1 hour to Eastern Standard Time (EST) or (GMT-5). Eastern Standard Time (EST) is 5 hours behind Greenwich Mean Time (GMT-5).