rsync option in cygwin
 

I am searching for a argument that tell rsync not to copy the data if only time stamp is different. I tested "rsync -avz", it will copy part of the file if the time stamp is change. (i did that by "touch" cmd).

please help/

Have you tried the option:

--size-only (skip files that match in size)

which looks like it causes rsync to ignore all time stamps.

yes. That works. Thank you so much.