|If you want to know the date the photograph was taken you need to look inside the file. Right click on the file and select properties > details. |
Depending on the camera used to take the photograph it will give information of the picture. Under origin is should give you the date the picture was taken. A good camera will also give you information on shutter speed, aperture, ISO speed and a lot of other information.
This only applies to the original photograph as it came out of the camera. One you modify and save the file, this information is lost. So it is always a good idea to keep the original digital photograph so as to preserve this information