When a traveller from India crosses the International Date Line while moving eastward, there is a change in time and date. The International Date Line is an imaginary line located at approximately 180 degrees longitude, mostly in the Pacific Ocean. It marks the divide between different calendar days.

Option 1 suggests that the traveller should turn his watch forward. This is not entirely correct as turning the watch forward would result in skipping a day. This would be incorrect for getting the correct day and time of the local area.

Option 2 is the correct answer as it suggests that the traveller should turn his watch forward and move his day calendar backward. By turning the watch forward, the traveller will adjust the time to match the local time in the area he is travelling to. Moving the day calendar backward compensates for the time difference, ensuring that the correct day is displayed.

Option 3 suggests that the traveller should turn his watch backward. This would not result in the correct day and time as it would be moving in the opposite direction of the time change.

Option 4 suggests that the traveller should turn his watch backward and move his day calendar forward. This would also not result in the correct day and time as it would involve skipping a day and moving the day calendar in the wrong direction.

Therefore