Is there a way to find the timestamp of a photo in an iPhone4, without syncing with a computer? Is there any way of figuring out when a photo on my iPhone4 has been taken, without first importing the photo to a Mac or PC?
Since the available photo options within iOS are limited, I don't think it's possible without any 3th party software.

King Camera is such an app. It shows some meta data about every photo you took with the app.