SMSCC events use WWV to set clocks to Coordinated Universal Time
(formerly known as Greenwich Mean Time), with the hour adjusted to local time.

Time dot Gov

Atomic Time dot Net

The following are amusing to watch but they are only as accurate as your computer's clock.

Monocrafts      Monocrafts Blocks

Magic Clock

WWV - Fort Collins, CO - (303) 499-7111
(note: that there may be a delay when calling from a cell phone)