how to setup this special cron?

to automate nginx. I just need to know what it should look like.

To automated /tmp cleanup add bellow cron 
0 */1 * * * /usr/sbin/tmpwatch -am 1 /tmp/nginx_client
via crontab -e command

Here is what my dolphin cron looks like:

/usr/local/bin/php -q /home/username/public_html/periodic/cron.php

Basically from SSH as root:

# crontab -e

and enter on a new line:

0 */1 * * * /usr/sbin/tmpwatch -am 1 /tmp/nginx_client

If tmpwatch isn't installed, install it with (if this is a CentOS server):

# yum install tmpwatch

thank you