doc: add description for TZ

README.md

@@ -79,6 +79,8 @@ You can find the latest published Docker images on Docker Hub:
     * Example: Specifying `FEED_API_KEY` = `X-API-KEY` and `FEED_API_VALUE` = `12345` will result in `X-API-KEY: 12345` being passed on every call to your GTFS-RT URLs.
     * `FEED_API_KEY` - If your GTFS-RT API requires you to pass an authentication header, you can represent the key portion of it by specifying this value.
     * `FEED_API_VALUE` - If your GTFS-RT API requires you to pass an authentication header, you can represent the value portion of it by specifying this value.
+* Miscellaneous
+  * `TZ` - The timezone for the server, ensure that the server's timezone matches the timezone of `GTFS` Route. For instance, if the routes are in New York, the server should be set to `America/New_York`.
 
 The `GTFS-RT` and `Google Map` related variables will be handled by the `oba/bootstrap.sh` script, which will set the config files for the OBA API webapp. If you want to use your own config files, you could set `USER_CONFIGURED=1` in the `oba_app` service in `docker-compose.yml` to skip `bootstrap.sh` and write your config file in the container.
 ```yaml