Use of "possibly" vs. "possible"?

Question

Why possibly and not possible? What is the adverb "possibly" modifying in this sentence?

Setting a cut-off date, possibly sometime in the first half of 2018, would aim to protect plants vulnerable to dicamba.

Barmar · Answer

Per dictionary.com possibly means "perhaps, maybe". So that phrase means "perhaps sometime in the first half of 2018".

In order to use possible you'd have to write something like:

It's possible we would set the cutoff date sometime in the first half of 2018.

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