Want this question answered?
When you cross the IDL, you turn your calendar one whole day, either forward or backward depending on what direction you're traveling. If you're traveling westward, with the US behind you and Japan in front of you, turn your calendar forward a day when you cross the line, and skip 24 hours. If you're traveling eastward, with China behind you and Canada in front of you, turn your calendar back a day when you cross the line, and repeat the previous 24 hours.
The Prime Meridian does cross parts of Mali.
The prime meridian crosses Lake Volta.
The prime meridian crosses Lake Volta.
Going west, you must tear the current day off of your calendar and dispose of it when you cross the IDL. Immediately as you cross, the date becomes one day later. It's not necessary to do anything to your watch, unless it's a calendar watch. If it is, then you do whatever you must in order to make it indicate one day later, but you make no change to the time.
Brazil
Nothing at all.
The Prime Meridian doesn't cross any territory of India.
Yes, you do.
Africa
Africa
Africa