†j.shall be: added to a future date in clauses measuring time. Cf. was in bev. Phrases 2b. Obsolete.
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the world > time > relative time > the future or time to come > in future [phrase] > will or shall be
shall be1617
1617 Sir T. Wentworth in S. R. Gardiner Fortescue Papers (1871) 25 To which purpose my late Lord Chancelour gave his direction about the 3. of Decembre shallbe-two-yeares.