Middle-of-the-month time (4)

I believe the answer is:

ides

(Other definitions for ides that I've seen before include "Eg March 15" , "Mid-month day in the Roman calendar" , "May 15, for example" , "Julius Caesar's unlucky day in March" , "March 15; dies (anag.)" .)

I've seen this clue in The New York Times.

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