Est Vs Edt 2025. Eastern daylight time (edt) is a daylight saving/summer time zone, however during winter some places adjust time for one hour back and observe eastern standard time. Est and edt are both time zones utilized within the eastern time zone of the united states and parts of canada.
Eastern standard time (est) eastern standard time. It turns out that est is the appropriate timezone for only half the year, the other half of the year is actually edt.