The visa requirement comes into effect at 12:01 a.m. EDT on July 14, 2009 (11:01 p.m. CDT Mexico City local time on July 13, 2009), but for the first 48 hours, you may apply for entry on arrival in Canada.
If you plan to arrive after 11:59 p.m. EDT on July 15, 2009 (10:59 p.m. CDT Mexico City local time), you will need to apply for a Temporary Resident Visa by sending an application to the Embassy of Canada in Mexico City. Please check the Embassy’s website for information on how to apply.