The 180th meridian or antimeridian is used as the basis for the International Date Line because it for the most part passes through the open waters of the Pacific Ocean separating the east and west hemispheres.
This line is known as the antimeridian or simply the 180th meridian. The international date line is sometimes used although it is not entirely correct. The international date line is a "political" convention and sometimes deviates signifigantly from the actual 180 degree longitude
.. Our clocks are designed to match the average motion of the sun.
India is still a developing nation and the people are happy and used to it now.
No. The Prime Meridian is. The International Dateline nominally (but not exactly) follows the 180° meridian ... exactly opposite and half a world away from the Prime Meridian.
None. The Pacific island nation of Kiribati used to be split by the IDL, but that was corrected in 1996. Since then, the line crosses no single political entity ... city, county, state, country, etc.
Used by date are a guide line, will last longer, but are put on the can to protect the manifacturer from being sued, give it a go, if not tasting to good throw it away.
Yes, its still being used for the many satellites out today.
Yes
This line is an emblem that has been used to show support for police officers. It is still used today.
No product should be used after it's expiration date. It may or may not still be good bcause the growth of bacteria isn't always on the same time line, but the dates are chosen to be as safe as possible. So heed them.
You're getting at the International Dateline. It roughly follows the line of longitude at 180 degrees east/west, and really has little to do with standardized international dates, whatever those are.