John, thanks again.
It seems that the instruction at Edit Capture Time differs when selecting a single photo and multiple photos.
I confirmed that multiple timestamps can be shifted.
Here are the photos:
SPP 5 jpg
https://dl.dropboxusercontent.com/u/1372441/Adobe%20sample/_P1M1575-spp5.jpg
SPP 6 jpg
https://dl.dropboxusercontent.com/u/1372441/Adobe%20sample/_P1M1575-spp6.jpg
I also found that SPP 6 is not yet supported for DP1m cameras. This could be the reason of the timestamp not showing up.
