How is “days are numbered” used?

In Watchmen (2009), one line is: “Our days are numbered.”

Which movie is “days are numbered” from?

The clip at the top of this page is from Watchmen (2009).

Our days are numbered.

4 作品で登場 · 1 本目

イディオム

a person or thing will not continue to live, exist or be successful for much longer

4 本の映画に登場

sb's / sth's days are numbered
a person or thing will not continue to live, exist or be successful for much longer
His days as leader of the party are numbered.

定義：Oxford Advanced Learner's Dictionary 第 9 版