The clock is in the hotel lobby which is open 24 hours a day.
Wikipedia https://fr.wikipedia.org/wiki/H%25C3%25B4tel_Cornavin
Official website http://www.fassbindhotels.com/fr-hotel-cornavin.html
Email cornavin@fhotels.ch
Phone +41 22 716 12 12
Address Boulevard James-Fazy 23, 1201 Geneva, Switzerland
Coordinates 46°12'33.69" N 6°8'30.429" E