sorry, no chinese input software, can only view :(
according to the current regulation.
a person has to be in Canada for 183 days in one year PERIOD. this one year period is not refering to the calender year. for example, you stays Jan to Jun in one year, then leave on July, and you want to return at May the second year, you have exceeded the time limite, unless you have the returning paper.
For your case, since you have the returning paper till May this year, you won't be worry before it expired. But the new regulations has no mentioning of the case you are facing: your PR status will be lost if you does not return to Canada before expired of your returnign paper according to the current regulation. Only the immigration department can answer your question.
The safest way to do is to return to Canada before expired of your returning paper and wait for the new act in action.