NavList:

But time to the nearest second does matter.  A few years ago a poster appeared on the local trains boasting that the trains ran to atomic time. The inference was that the train crews had an app on therir phones  displaying UT.  It was an era when there was a fad to wear a phone strapped to the arm rather than wearing a good old fashioned wrist watch. The poster was displayed for only a week or two and then it disappeared - maybe the PR people had had a change of mind.

To put this in context, in NZ when a train runs late someone will (often quite seriously) point out that in Japan if a train departs one second late the driver apologises. If it is two seconds late he is sacked. All joking aside every action is logged to the nearest second or fraction of a second. Penalty payments depend on what is in the log.