When I create a lease in flag it as a migrated lease, what are the correct dates to use?

Summary:

My lease starts 1 Jan 2023 and I migrate the lease as at 31-Dec-2023, 1 Jan 2024. I create the lease with the proper term dates start date and end date as per the contract, I flag it as migrated lease. The lease start defaults as the migrated date. Shouldnt I be able to provide the migration date? ANd maintain the original lease dates in the term dates? I want to take on the balances as at 23 Dec 2023 which I will be able to do because I ticked the migrated lease flag.

I am not sure about the migrated date. Any help on this will be appreciated.