DCL will use a "season" from 1 September to 31 August of next year, to help with inviting clubs to the dcl competitions. Each federation that holds a national competition during this season can be invited to the next DCL competition that is held following the season (Art. 1.01 Football and Futsal rules)
E.g. If a federation has their national league or Cup competition(s) during 1 September 2018 to 31 August 2019, then DCL invites the clubs to the 2019/2020 competition. If the national League or Cup is played or completed after 31 August 2019, the clubs from that Federation are invited to the following years DCL competition in 2020/21.
*: Only can be invited clubs to the DCL competitions that were qualified in their National League or Cup competition (s) during 1 September 2018 to 31 August 2019.