Is a big problem. Do you display GMT or adjust to the users timezone? How would you apply DST to pictures? Wouldn't the picture require GPS coordinates so we can pick out the time that applied for that day in that location?
And we're just getting started.
On Windows the date could be the file creation date, modication date, time you looked at it last or the EXIF data and all this may have to be modified as noted in my first paragraph.
Not to disappoint you but as you can see, no one knows what time it is.
I just downloaded Picasa as recommended by many people as the best free photo organizer and editor around. I have yet to use it because the first thing I noticed is that all the dates on my pics are wrong! I know this for a fact because my camera (which is correctly dated) records the dates and also because when I load pics onto my computer they are labeled with the event (ie Bills Birthday, Hang Daddy on the beach) - so I know exactly when they were taken without a doubt! I don't want to go making adjustments to the pics before I know if I can make corrections to the dates; or should I shop around for a different editor all together?!