seoyoungjun, are you sure the timestamp is not there, just hidden because the name is too long to display all characters? If you make the caption bar larger, is everything there? When exporting via the Ajax client, the QVServer creates the file server-side and then pushed the file back to the client via the web server, so I am not sure there should be any difference here, I seem to be missing something, can you further clarify the use case?
Just checked functionality and all we write is a GUID based name.xls or xlsx file, no timestamp included in the file name, so I am not sure how you are getting the date in there, I did open the file as well, and the Excel caption does not show timestamp there either, I am running 12.40 SR1.
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