The 910 is capable of displaying the time of day, but it should be glaringly obvious to anyone that owns one that telling you the time is a peripheral feature that comes for free because of the nature of GPS devices. Combine that with a 20 hour battery life (probably far less if you're in an office and the GPS receiver is cranked all day), huge size, and questionable aesthetics, and it's obvious that Garmin did not intend for you to wear it to work. Not that it keeps people from trying if the Garmin forums are indicative of anything.

And Captain Pedantic has swooped in to inform us that the ridiculously accurate clocks live on the GPS satellites not on the device.