38 C.F.R. § 21.9555

In determining the entitlement of an individual who is eligible for supplemental educational assistance, VA will—

(a) Calculate the individual's entitlement to 38 U.S.C. chapter 33 educational assistance on the day he or she establishes eligibility for supplemental educational assistance; and

(b) Credit the individual with the same number of months and days of entitlement to supplemental educational assistance as the number calculated in paragraph (a) of this section.