Bulk updating or correcting entires?

I ran into an issue where I was logging development tasks under my general software development duties and a superior advised that I should have been logging certain work to a specific project. He asked me to retroactively correct and update my timesheet with the correct task entry.

I’ve emailed support about this already and they indicated there was no automated way to do this.

Does anyone know of a script or trick that would let me change any entries for task A to task B over a range of dates??

I think I could script this using the API, and I can always do it by hand (yuk!). I figured I’d ask before getting into it.

TIA