International date line What if international date line being shifted to Atlas Ocean? Most of trade partners will have different date, States and all America continents will enter day first etc. So what can be coincidence of this? I am asking this because I have read that samoa was shifted to have better trade partnership with Australia.
The consequence would be confusion, if someone is further east of you it's natural to think they're ahead of time (relative to you).  Especially if you're used to the ubiquitous maps of the globe (with Europe/Africa in the middle, the Americas to the left and Japan/Oceania on the right).  Confusion then might arise in some economical contexts that are highly standardised.

For example, spot transactions on the forex markets are delivered (cleared) in 2 days.  If someone behind the date line trades on your behalf you might have to wait 3 days, or just one day for the funds to clear, depending on what side you're on.  Also in your example, think of recurring events (like quarterly reports, dividends, etc.), you might still be on the day before they're due but time-wise (just the hours on the clock) you're ahead.  Or if you're west of the date-line and waiting for events from someone east thereof you have to wait another day.

If the explanations above are confusing then that's exactly the point I'm making.  So, my opinion, if you wanted to pull off something like that without confusing people you'd also have to establish a new prevalent mapping of the globe, with Europe/Africa far to the "west" and the Americas on the far "east" side.  Of course, established terms, like far-east, western society, etc. have to be recoined as well.