Future perfect tense is an absolute-relative tense that refers to a time located before a contextually determined temporal reference point that must be located in the future relative to the moment of utterance.
(English)
Mish, Frederick (editor). 1991.Webster's ninth new collegiate dictionary. Springfield, MA: Merriam-Webster. 1,564 pages. 0877795088; indexed 0877795096; deluxe 087779510X.
Comrie, Bernard. 1985b.Tense. Cambridge, England: Cambridge University.