I have been asked by a client to see if Bing Custom Search can order results containing links to PDFs by file modification date.
I know results can be ordered by the date the content was indexed (or re-indexed), but they are concerned with the actual age of PDF files as determined by the filesystem timestamp, and want to order the results by that criteria.
I could not find anything in the Azure documentation, and personally I don't believe it is possible, but I wanted to check in with SO first.
I don't believe this specific scenario is currently supported at the time. But if this is a feature you would like to see supported in the future, you may leave your feedback on Uservoice.