Due Date

As a matter of fact, it could be another meaning of deadline
http://www.thefreedictionary.com/due+date

However, true story here, when I was in a graduate school party and I was not aware there was one woman who was expecting. SO, when one of faculty asked her when was her due date (意指何時生小孩),
and I thought
she was asking me (you know, in the party group, plus noses, distraction and all that in the party).
I thought she asked when we had to
turn in the final paper for one prof's class....oh...well...only I could say that was very embarrassing moment.
That was more than 10 years ago. Now I am able to joke around under this kind of case.

Anyhow, be aware of the situation when someone asks this kind of questions, nothing serious though, unless...hum...

due date: 預產日
               繳費日
               交報告日
               （總之是，你欠啥而該交啥的日子囉）