Many people do not recognise the issues we currently have with the man made date line and the Sabbath Yahuwah set in motion when He created the earth.
He tells us in Genesis 1:14
14 Then Elohim said, “Let there be light-bearers (sun, moon, stars) in the expanse of the heavens to separate the day from the night, and let them be for signs, and for marking appointed times, and for days, and for years;
You see he never told us to use a man made date line. The problems we see with a man made date line pose some serious issues for those wanting to know His appointed times. Here is an excerpt from a video from worlds last chance.
So how does the world keep time today? What problems does that cause? The video below cover this:
The Calendar of Scripture 