at (some time) sharp

At an exact time, with the emphasis that one must not be late. We need to leave for the airport at 8 AM sharp tomorrow morning. Please be here at 6:30 sharp.

Common Names:

Name	Pronounced	Usage
Nikusha	-	Georgian
Giacinta	jah-CHEEN-tah	Italian
Aurea	-	Late Roman
SÉRaphine	se-ra-FEEN	French
Rostislav	rahs-tee-SLAHF (Russian)	Russian, Czech, Medieval Slavic
Bernice	['bə:nis]