In Canada, Time Zones and Daylight Saving Time usually have been regulated by
Canadian
provincial and territorial governments. Exceptions may exist in certain
Canadian municipalities.
Clocks in Canada are turned forward by one hour on the second Sunday in March and turned
back on the first Sunday of November.
USA & Canada clocks
Daylight Saving Time dates 2012
Sunday 11 March 2012 2am local time
until Sunday 4 November 2012 2am local time
see: Daylight-Saving-Time.com
for details
USA and Canada Standard Time Date schedules
here