WHEN EARLIEST CAN I RENEW MY SPOUSE VISA.........

[sniper1975]

hi everyone
could you guys kindly help me calculate on when the earliest i can renew my spouse visa please....
i was on discreationary leave to remain DLR then switched to spouse visa which is
valid from 10-12-2015
and expires 08-07-2018
and thats 31 months

my 30 month anniversary is on 10-06-2018, with the 28 day early application submission rule in place am i right to assume that the earliest i can submit my application is 10-06-2018 minus 28 days = 13-05-2018
please help
thanls