I would like to know license expiry date of installed Server Express 5.0.

I got output from apptrack as follows

Installed Application Server licenses:
----------------------------------------------------------
00001
/apps/ServerExpress
Version        of Server for COBOL
License users: Unlimited    CPUs: 001
Duration: Unlimited         Server

As per one article in microfocus community           Duration means 

Duration: Unlimited

Note: Unlimited rather than an expiration date indicates this is a purchased license, not a temporary evaluation key or an emergency issue from SupportLine.

 So how to know actual expiry date of existing license?

Thanks in advance