How CIC count days in Canada

I am a new immigrant to Canada, but I am also a student in the U.S. My question is that how can the Canadian Immigration Services know how many days I spend in Canada since they don't inspect me when I go back to the U.S. Or is there any kind of system that the Canadian immigration use to keep track of its permenant residents' physical presence in Canada?

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• 你可以按你的想法先试试 -试完就知道- ♀ (25 bytes) () 09/13/2004 postreply 22:37:10

• 回复：你可以按你的想法先试试 -Xiejoe- ♂ (8 bytes) () 09/14/2004 postreply 09:09:55

• 回复：How CIC count days in Canada -huadie- ♀ (119 bytes) () 09/14/2004 postreply 12:23:30

• 回复：回复：How CIC count days in Canada -xiejoe- ♂ (105 bytes) () 09/14/2004 postreply 15:30:26

• Your passport -beHappyLOL- ♀ (362 bytes) () 09/14/2004 postreply 12:40:54

• 回复：Your passport -Xiejoe- ♂ (6 bytes) () 09/14/2004 postreply 15:31:35

• 回复：Your passport -huadie- ♀ (369 bytes) () 09/15/2004 postreply 12:48:49

• 回复：回复：Your passport -xiejoe- ♂ (200 bytes) () 09/15/2004 postreply 13:15:15