Delaware issues 2 types of registrations. For 1 year or 3 year.
However, they work with calendar years, meaning the 1 year register is valid until the end of the year, a register done 5 June 2021 will expire 31 December 2021.
For the 3 year register the register expires the running year +2, meaning registration done on 5 June 2021 will expire 31 December 2023.
However if you request the registration between 15 October and 31 December it will be valid for the full year or full 3 years, which applied. Frequently Asked Questions