An assignment is effective at 12:01 a.m. on the first day of the month following the date on which BOEM approves your request, unless you request an earlier effective date and BOEM approves that earlier date. Such an earlier effective date, if prior to the date of BOEM's approval, does not relieve you of obligations accrued between that earlier effective date and the date of approval.
30 C.F.R. §556.806