Hi
Healthcare in Alberta would commence from day-1 of your application. As u receive the Health Cards u may move to Ontario... The same would remain valid for 2 months... The OHIP would be available to u in 90 days only... Thus, u'd have a month's void period.
Qorax
No they won't, the OP has already "landed" over a year ago in Ontario. Alberta is going to consider that he is just moving from another province. Here is a quote from the Alberta Medical Insurance site.
"Moving to Alberta from another province or territory?
You are eligible for AHCIP coverage on the first day of the third month following your date of arrival. You should register before the first day of the fourth month after you arrive. If you apply later, the effective date of your coverage will be determined when you register. "