有同样的疑问。刚看了下楼上提供的链接， 看到下面这段话。那就是如果我七月去就不需要申请是吗？

New entry requirement now in effect: visa-exempt foreign nationals are expected to have an Electronic Travel Authorization (eTA) to fly to or transit through Canada. Exceptions include U.S. citizens, and travellers with a valid Canadian visa. Canadian citizens, including dual citizens, and Canadian permanent residents cannot apply for an eTA.

Note: Until September 29, 2016, travellers who do not have an eTA can board their flight, as long as they have appropriate travel documents, such as a valid passport. During this leniency period, border services officers can let travellers arriving without an eTA into the country, as long as they meet the other requirements to enter Canada. Find answers to your questions about the leniency period.