Subscription Question

[Renalt]

I apologize if this is in the wrong place or has already been answered somewhere else. I recently purchased the Complete Edition and am still within my 30 day free subscription courtesy of the purchase. My question is about the monthly subscription.

If I purchase one month of subscription while still having several days of my free subscription left, will they overlap or will the new month begin once my free time is used up?

I believe the day your free ends then your actual sub begins.