Period	Time Zone	UTC Offset	Observing DST	Reason for Change
Before March 8, 2015	Eastern Standard Time (EST)	UTC-5	Yes	Standard time observed historically, aligned with cities like New York.
March 8, 2015 - November 4, 2018	Atlantic Standard Time (AST)	UTC-4	No	To maximize daylight during the peak tourist season.
After November 4, 2018	Eastern Standard Time (EST)	UTC-5	Yes	Reverted due to the complexities introduced by the AST period and to align with historical timekeeping.