A la Hora Exacta

Sharp, on the dot.
The meeting will start at 7:10 on the dot.
The class will finish at 1:45 sharp.

References in Dictionaries:

I'll be there at noon on the dot. I expect to see you here at eight o'clock on the dot.
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You must be here at noon sharp. The plane is expected to arrive at seven forty-five sharp.
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Heures précises en anglais in English.