on/at the stroke of eight, midnight, etc.

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on the stroke of (some specific time)

Exactly at a specific time, especially the very beginning of the hour. The store is opening its doors on the stroke of midnight for the Black Friday sale. If you're not home on the stroke of 11, you're grounded!
See also: of, on, specific, stroke
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

on/at the ˌstroke of ˈeight, ˈmidnight, etc.

at exactly eight o’clock, midnight, etc: She gets to work at the stroke of nine every day.
See also: of, on, stroke
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
But at the stroke of eight, the lights went down, the crowd erupted into screams of ecstasy, the band struck up and a few minutes later, John bounded into the same spotlight that bathed his grand piano.
With Morrison on stage at the stroke of eight and abruptly off again at 9.30pm, most of the crowd must have been wondering if he was pulling double shifts.