楼主，下文是我从当时出EOL政策时的FAQ文件中找到的：
Would I have to complete a skills assessment and/or an English language test before I submit an EOI?
Yes. Your EOI will need to be based upon facts as they stand at the time you express interest in migrating. If you are invited to submit a visa application, it is envisaged that you would have two months to finalise all necessary documentation and to lodge your application. The invitation would expire at the end of two months.
根据这段问答，我理解是时间点是以你提交EOI时算。
作者: fdgfde 时间: 2011-7-7 05:28
谢谢楼上，我在FAQ文件中看到下面这个，不知道如何解释啊？
What would happen if I don’t get invited?（这个地方是提问的，下面回答的）
Your EOI would remain in the database for potential selection for two years from the date that it was submitted. During this time, you may be selected in a subsequent invitation round. You must update your details if your circumstances change. Additionally, if you have expressed interest in an employer sponsored visa, you may be contacted by an employer directly to discuss sponsorship.