So i read that IE8 and older browsers do not support "Max-Age" inside of set-cookie headers. (but all browsers and modern support expires)

add_header Set-Cookie "value=1;Domain=.networkflare.com;Path=/;Max-Age=2592000"; #+1 month 30 days

Apprently they support "expires" though so i changed the above to the following but now the cookie says it will expire at end of every session.

add_header Set-Cookie "value=1;Domain=.networkflare.com;Path=/;expires=2592000"; #+1 month 30 days

how can i tell this to expire 1 month into the future all the examples i find mean i have to set a date manually what would mean restarting and editing my config constantly. (automated would be nice)

http://www.networkflare.com/