Which EXIF date is the right one?

[Nutter]

I'm working on a script that pulls the date out of EXIF, but there are several possible date fields...

DateTime
DateTimeOriginal
DateTimeDigitized

I assume DateTime is probably the safest, but I don't have anything other than a Canon 10d JPG to test with.

Any thoughts as to which to use?

[Nutter]

Oh, one more question.

The format I'm seeing is YYYY:MM:DD HH:MM:SS - is this a standard?

[Nutter]

I seem to be answering my own questions :)

DateTimeOriginal seems to be the one that stays correct, so that's what I'm using for now.