1. If you start in Los Angeles, CA and go WEST over the International Dateline, you would move your calendar a day. 2.If you start in Sydney, Australia and go EAST over the International Dateline, you would move your calendar a day.

1. If you start in Los Angeles, CA and go WEST over the International Dateline, you would move your calendar___plus a day.

2. If you start in Sydney, Australia and go EAST over the International Dateline, you would move your calendar__minus a day.

Explanation:

When Mr. John Hawthorne crosses the International Date Line (IDL), the day and date change.  If he crosses the International Date Line, traveling westward, the day goes forward by one, and the date increases by one.  On the other hand, if he crosses the International Date Line, traveling eastward, the day goes backward by one, and the date decreases by one.