In the meta information are the dates switched.
Picture made for example in July and changed in August is switched. So, there is standing made in August and switched in July. Just the month; the day and year are allright.
I use the Dutch trial version of Photoshop Elements 11.
I use windows 7.
If you open an album in Media ten at the right point at meta information and you can see the date of making the picture, the date you stored the picture the last time in Elements, what kind of camera you used and the exif information of the picture.