To be clear, AP licenses on ZD 1200 to manage APs (or other controllers from Ruckus) are perpetual licenses - in other words, these licenses don't expire as long as the same end customer who bought owns it.
That said, I believe you are referring to "Support" contract expiration. To verify the exact end date, after login to ZD, pl go to 'Administer->Support'. On the right side, look under "Date to End".
To address recent KRACK vulnerability Ruckus has provided "free" software upgrade for all customers including those who don't have valid Support contract. To enable free software upgrade for those who don't have valid support Ruckus provided support entitlement which will expire on Jan 31st, 2018. For more info you could check out
https://ruckus-support.s3.amazonaws.com/private/documents/2046/Ruckus%20WPA2%20Vulnerability%20%28KR...This date seems to coinciding with your 65 days expiration from today. Have you purchased a Support for your ZD?
I don't think it is a bad arithmetic.