http://nginx.org/en/CHANGES:
Changes with nginx 1.9.7 17 Nov 2015
...
*) Bugfix: the "expires" directive might not work when using variables.

Using the latest version of the branch​ might solve problems...
---
*B. R.*

On Sun, Jan 24, 2016 at 8:21 AM, rgrraj <nginx-forum@forum.nginx.org> wrote:

> Hi Francis
>
> The same works like a charm in 1.9.6 but not in 1.9.2. The error log shows
> the follow,
>
> "[emerg] 6151#0: "expires" directive invalid value in" respective sites
> enabled file.
>
> And our configuration is just as follows,
> ## in nginx.conf
> map $time_iso8601 $expiresc {
> default "3h";
> ~T22 "@00h00";
> ~T23 "@00h00";
> }
>
> ##in sites enabled file,
> location /path/to/files/ {
> expires $expiresc;
> }
>
>
> doesnt allows to restart nginx and fails with the above error in nginx
> error
> log.
>
> Any thoughts ??
>
> Thanks
> Govind
>
> Posted at Nginx Forum:
> https://forum.nginx.org/read.php?2,115406,264082#msg-264082
>
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