The ending date of the 60-month period is the last day of the 60th calendar month
                  after the end of the prior DIB entitlement or the end of the prior freeze period.
                  If a new period of disability is established within the 60–month period mentioned
                  above, the period ends with the month before the first month throughout all of which
                  the NH is under a disability.
               
               Where the current disability begins on the first day of a month, the period will end
                  with the preceding month. If it begins on a day other than the first day of a month,
                  the period will end with the month in which the current disability began.
               
               EXAMPLE: A claimant’s period of disability terminated 11/30/2015 (12/2015 is the T8 month
                  on the MBR History line and the DBC entry on the DIB line) as he was no longer disabled.
                  The 60-month period would be 12/2015 through 11/2020. The claimant filed for a new
                  period of disability on 2/18/2021. The DDS established the claimant was disabled on
                  8/14/2020. The claimant does not have to serve a waiting period because his new period
                  of disability, the date of onset, falls within the 60-month period. The claimant’s
                  entitlement date would be 09/2020.