I don't think that would cause any confusion. However, to be safe, you could use from then.
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SuperESLCan 'hence,' in the sense of 'from now', be used in a past context? As in:"Stalin swore in 1938 that he would complete agricultural collectivization by the end of the decade, two years hence." ?No. You need 'thence'. Note, however, that both 'hence' and 'thence' in the temporal meanings are marked as archaic in the Merriam-Webster on-line dictionary
CalifJimYou need 'thence'. … and 'thenceforth',…Ah! Good call! I wasn't aware of those little gems. Archaic or not, I like them.