When importing images directly from a camera, all images in the Import panel appear to be time stamped with the current time, rather than the original capture time. (Note that after import, the images will display the correct capture time.)
This issue can occur if a camera is directly connected to the computer, and the camera is set to PTP file transfer mode. There are several ways to avoid the issue:
Any of the above will resolve the issue.
This issue is resolved in Aperture 3.