I'm sorry, but when you asked this question, you indicated that Illinois was the operative jurisdiction:
Country relating to Question: United States
State (if USA): Illinois"
Per Indiana law, Indiana Rules of Trial
Rule 60. Relief
from judgment or order
(A) Clerical mistakes. Of its own initiative or on the motion of any party and after such notice, if any, as the court orders, clerical mistakes in judgments, orders or other parts of the record and errors therein arising from oversight or omission may be corrected by the trial court at any time before the Notice of Completion of Clerk’s Record is filed under Appellate Rule 8. After filing of the Notice of Completion of Clerk’s Record and during an appeal, such mistakes may be so corrected with leave of the court on appeal.
Also per Rule 9(a) of the Indiana Rules of Appellate Procedure, the 30 day limitation is the same.
The result is the same, in that the court retains jurisdiction to amend clerical errors, but substantive errors are final after 30 days.