Noramally if it is bright out then it is day, and if it's dark it is night... but in a jam I use a Fin (thats the bar keeps name) and he has a watch on, and that lad is normally right on.:SIB
But if I had to buy one the I quess..... Swatch Watch (Green and Orange) or the G-Shock because I liked the commercial with the hockey players using it as a puck.
just lost the watch i've had for over 10 years. luminox. awesome watch, i wore it all the time, doing construction, swimming, you name it.batteries replace after about 7 years.