 FAIR: The Japanese are shown flipping a calendar from the 6th to the  7th of December on the morning of the attack. This is done for  American audiences who are familiar with the date of the attack  being 7 December 1941. Clocks aboard the Japanese ships were kept on  Tokyo time, so for them the attack actually took place the morning  of 8 December. The Japanese version of the film shows the calendar  flipping from the 7th to the 8th.