Q. What takes place when you travel across the dateline?
Answer:-
If westbound the day modify to the next day. If eastbound the day is the day prior to. Appears strange but it all works out.
Let's imagine we are on the beach in the early evening west of the dateline at 4:59 PM Tuesday. If we whirl eastward across the dateline as well as continue east seven time zones it will be 11:59 PM Monday. We rest from all this exercise as well as ponder the strangeness of turning back a day. Whew! one additional minute and it will be Tuesday anyway. Carry on 17 more time zones (24 totals) eastward and it will be 4:59 PM Tuesday. Just similar to we left it. It works simply fine in the reverse going the other way.