You can use "henceforth" to indicate that something will happen from now on. For example, "Henceforth, all employees must clock in upon arrival."
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We are short of water, and henceforth cannot go on.
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The cast of Henceforth to the Stars - 2013 includes: James
Kaliszuk as Lover
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No, "henceforth" is an adverb used to indicate from now on or from this time forward. It does not function as a conjunction connecting phrases or clauses.