[emergentcypher]

The only time I could ever see us adopting new calendar systems is when (if) we eventually migrate off-planet into space colonies or onto other bodies in the solar system. Why? Because only then will each colony have a completely different notion of what a solar year is, and different (or even entirely artificial) notions of solar days. In these colonies a standardized calendar system may arise. Or a chaotic web of independent calendar systems.

[JoeAltmaier]

Perhaps just a count of seconds from some zero point. Mark intervals in kilosecs and megasecs. Then the computer time-counter register will be the only clock anybody needs. Never mind 'Wednesday'. "See you in a megasec!" which is about 11.6 of our 'days'.

[tekromancr]

The problem there is that seconds are relative to movement. If you are traveling faster than earth, your clock is going to lose sync.