Sometimes local date-time (with optionally a location) is better. If I tag a photo as Christmas morning and upload it to a global photosharing site, I'd expect

Sometimes local date-time (with optionally a location) is better. If I tag a photo as Christmas morning and upload it to a global photosharing site, I'd expect something that says when I took it in my local time and optionally location. I don't care about UTC or the photo's timestamp in the viewers timezone. If you want to make it complicated store UTC + offset (not timezone).