Including the deadline of the day, but the deadline of the general meeting will change at any time. For example, the deadline is 18. If you go to see it again in a few days, it will become the deadline of 25, and then add a sentence, at the request of the majority of authors, postpone the deadline and so on. In fact, it is a strategy that requires you to contribute quickly. So you just need to look at the date of the meeting. Generally, you can vote within half a month before the meeting date. If you still don't understand, I suggest you search Baidu: EI Academic Conference Center, which contains a lot of knowledge and detailed instructions about EI conference, which is very comprehensive.