We are halfway into our cruise, and this is an unusual day.  Yesterday was May 3, and so also is today.  We crossed the International Date Line. I remember once spending a whole day in Tokyo on my birthday.  Caught a 6:30PM flight back to Honolulu.  Arrived at 7AM.  Spent another whole birthday. What is the  International Date Line? A line between the South and North Poles, passing through the Pacific Ocean, roughly following the 180 degree line of longitude, If on the east side, say, Tuesday....on the west side then would be Monday. On the opposite side of the globe is the  Greenwich meridian . The time just west of the international date line is 12 hours ahead of Greenwich mean time. The time just east of the IDL is 12 hour behind GMT. A traveler going west across the date line adds a day, like us.  That is, we are now having our second May 3, back to back. This is the difference that made Phileas Fogg win the bet in 1956 Around the World in 80 ...