Just enter 12/31/2024.
Ohio revised the SD 100, last year to accommodate people who move. they coulda done a better job.
This question is only asked if you are a partial-year resident. If that is the case, make sure you enter the date as two-digit month and two-digit day. Enter the date that you first moved in to Ohio and enter 12/31 for the end date. If you are a full-year resident, it shouldn't ask for these dates.
If you continue having issues with the return, you can try to delete your state and start it again. You might also need to clear your cache (that is, remove these temporary files) because a full or corrupted cache can cause problems in TurboTax. You can try these steps if you are using the online version:
Please reach out again if your problem persists.