How do the subscription work ?

I mean is it peroidicly based? (if its a 30 days membership purchesd on 1st on january,it will end on the 1st of fabuery) or timely based? (I mean if you purchesd 30 days of membership,the membership will expire after you played for a time period that equales to 30 days).

The subscription model works like in World of Warcraft and the other Online Games. The time also counts if you don't play the game. So it's a periodically system.

Its periodically system