Please help ! Can I cut-off New G/L migration date during fiscal year ?

Dear Experts

I know that the principles of migration date of New G/L migration should be on first day of fiscal year and Year-end closing of the old fiscal year must be complete before New General Ledger Accounting is activated.

However, if I need, can I cut-off new G/L migration date during fiscal year before year-end closing ? And Which points should be concern.

Best regards,

Suphawat