heretofore vs until now

heretofore and until now both are adverbs.

Word	Noun	Adjective	Verb	Adverb
heretofore	No	No	No	Yes
until now	No	No	No	Yes

As adverbs, heretofore and until now are synonyms defined as:

heretofore and until now: used in negative statement to describe a situation that has existed up to this point or up to the present time

Other synonyms of heretofore include as yet, hitherto, so far, thus far, til now, up to now, yet.

heretofore (adverb)	until now (adverb)
used in negative statement to describe a situation that has existed up to this point or up to the present time	used in negative statement to describe a situation that has existed up to this point or up to the present time