Adjust Time of Multiple Photos By Fixed Amount

Is there any way to adjust the time of multiple photos in an album by a fixed amount? In other words, I want to select multiple photos within an album and have the time of all these photos incremented by a fixed number of hours. I looked at the “Batch Change” menu item, but it doesn’t provide the capability that I am looking for.

The motivation for my question is that the album contains some pictures taken with a camera and some with my iPhone. The iPhone had the correct time of day, but the camera was set to the wrong time of day, because I didn’t update the camera’s time for a time zone change.