[dragonwriter]

> Henry points out that from a physics perspective, there is only one time.

Relativity rather forcefully disagrees with this contention.

> The professors—who also propose an unchanging calendar that would always start on a Monday, but let's deal with one crazy time-keeping idea at a time—are hoping that the world will adopt their plan in 2018.

It is somewhat more likely that human civilization will be completely annihilated by a to-this-date-unknown object smashing into the Earth between now and 2018 than it is that the world, or any significant subset of the political jurisdiction that exist on it, will adopt this plan in (or by) 2018.

[dllthomas]

Relativity disagrees with one time, but not in a way that usefully aligns with time zones.