How Much Does It Cost to Fix My Photo Dates?
Free for a small library. Around ten dollars, once, for an unlimited one.
Free tools exist and work, if you are willing to learn a command line. Paid desktop tools for this job generally sit under fifteen dollars, because it is a task you do once and then forget.
Watch for subscriptions. Paying every month to keep access to your own photo library is a poor trade for a job that finishes in an afternoon.
Takeout JSON Metadata Fixer is free for 500 photos and $9.99 once for unlimited, on macOS, Windows and Linux. No subscription, and it keeps working offline.