let's meet in front of the cinema at six fifty.I think it's

let's meet in front of the cinema at six fifty.I think it's on at seven.这是一个英语短文中的句子.
以下有一个判断题：They are meeting before 7 P.M.（是对是错?答案上是对,可是短文中是6;50之前见面,这个句子说7点之前见面,为什么对啊?）