sentence improvement

问题描述:

sentence improvement
I landed on Chicago on a sunny day in August 顺序是否正确?有没有简便的写法?
not until 5 days ago started I realize the meaning.倒装句中用I还是me?

第一句顺序是正确的吧
第二句个人觉得倒装句好像不大对的样子 应该是
not until 5 days ago did i start realizing the meaning