Assuming that your digital camera records time to the nearest second and that you have access to a handheld gps with track logging, do the following:
1) Turn gps on and get good fix.
2) Whilst ensuring a good gps fix, wander around and take photos
3) The important bit - take photo of gps display showing time
4) From last photo work out difference between gps time and camera time
5) Go back over photos to see when taken, allow for difference in time and then extract location from gps track log for the appropriate hour.
Bit long winded, but saves buying a fancy SLR!
