Hi Pham Manh Hung,
thank you for your advise.
I have see it some days ago in a different post. And I have tried out immediately.
My test PC have Windows 8 and I could update the Author for Windows 7 as well, but not with Windows XP.
All the pictures have now the identical Modification date and shortly after syncing the order is by name, but after a while the iPad relalize the trick and is sorting using the Creation date from EXIF date, which is the "correct" way.
I am currently doing some tests together with Sgadan Ruadh using PhotoMgrPro and sync with Cyberduck.
We have not finsihed, but we are optimistic.
Overall it is only an issue when you are using the Folder Sync in iTunes.
iPhoto and Aperture are able to transfer "their" sorting over to iPad.
The sorting by date (with Folder sync) is best for most of user, because only a few are renaming the pictures.
Imagine you have 3 friends one with a Sony camera ( DSC 00xxxx) , one with and Olympus (PB123456) and the third with an iPhone with IMG_12345 were on an hiking tour and afterwards they share the pictures.
Only a "picture taken date" is displaying it in the "correct" order.
OK, if one has a wrong clock setting, you need to have a date adjuster tool. iPhoto, Aperture, Lightroom or GraphicConverter have such batch adjustments functionality. If you have a Mac then you find a little tool called "Photo Date Changer" in the App Store (Mac).
By the way, Sgadan Ruadh mentioned that some pictures have not shown up after Sync.
These pictures had JPE suffix, a simple rename to jpg is solving the issue.
If you have special requirements, then you need to have special knowledge.
best regards
Peter