Actually no, ngx.time() is not expensive, it uses the cached value stored in the request so it doesn't need to make a syscall.

> On Sep 9, 2016, at 06:33, itpp2012 <nginx-forum@forum.nginx.org> wrote:
>
> Good, keep in mind that "ngx.time()" can be expensive, it would be advisable
> to use a global var to store time and update this var once every hour.
>
> Posted at Nginx Forum: https://forum.nginx.org/read.php?2,269438,269444#msg-269444
>
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