There are several different time zones EST, PST, EDT, PDT. The difference between edt and est is that EDT is during the spring and EST is during the winter. If you are needing to convert your time zone to another time zone visit http://www.timeanddate.com/worldclock/converter.html. EST stands for Eastern Standard Time and EDT stands for eater daylight time. EDT starts on the second Sunday in
. March and EST starts on the first Sunday in November. The same rules apply to Canada.