I am confused by the info here. But here is the official version from CIC as how to calculate your residence in Canada:
http://www.cic.gc.ca/english/citizen/res-calc.html
Residence Calculator
You can use the residence calculator to find out if you have lived in Canada long enough to be eligible for citizenship. If you have, the calculator will tell you that you are eligible to apply. If you have not, it will tell you when you will be eligible to apply.
The calculator is for permanent residents applying for citizenship as adults (18 years of age or older).
What are the residence requirements?
To be eligible for Canadian citizenship, you must have lived in Canada for at least three years (1,095 days) out of the four years preceding your application. When calculating your time in Canada:
each day you lived in Canada before you became a permanent resident counts as half a day;
each day you lived in Canada after you became a permanent resident counts as one day;
only the four years preceding the date of your application are taken into account.
How do I use the residence calculator?
Fill in all the required information.
Make sure you enter all dates correctly.
Make sure you list all your time away from Canada in the last four years.
Residence Calculator
The Residence Calculator is for permanent residents applying for citizenship as adults (18 years of age or older). You can use the residence calculator to find out if you have lived in Canada long enough to be eligible for citizenship. If you have, the calculator will tell you that you are eligible to apply. If you have not, it will tell you when you will be eligible to apply.
CALCULATION OF RESIDENCE FOR CITIZENSHIP (yyyy-mm-dd)
A Enter the date when you first came to Canada to live. A ( )
B Enter the date you became a permanent resident of Canada (see box 45 on your Record of Landing (IMM 1000), box 46 on your Confirmation of Permanent Residence (IMM 5292) or the back of your Permanent Resident Card). B ( )
C Enter the date you will sign the application. C ( )