I know that. One small problem, I need store attachment with current date (date of duplicates) in attachment name (or similar solution).

Oh ok. You could try changing the attachment prefix of the report to include the current date?

(In developer mode)

Settings > Technical > Reports > Reports > Duplicates -> "Save as Attachment Prefix" = time.ctime()

Note: This will be in UTC

Thanks. In fact, the time.ctime() works in generation attachments name. For me, the better is time.strftime(%Y-%m-%d). Problem remains - the timezone.