Hint: London is England's and the United Kingdom's capital and largest city. It is located on the River Thames in southeast England, near the mouth of an estuary that stretches for 50 miles (80 kilometres) to the North Sea. For two millennia, it has been an important settlement. The City of London, the city's historic heart and financial centre, was founded by the Romans as Londinium and retains medieval borders.
Complete answer:
Greenwich Mean Time (GMT) is observed in London. The Prime Meridian lies 821/2 degrees east of the Indian Standard Meridian. As a result, Indian Standard Time (IST) is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT). As a result, at midnight in London, it is 5.30 p.m. in India. Because the earth rotates from west to east, the sun's rays hit the easternmost longitudes first. As a result, nations on the eastern side of the Prime Meridian are ahead of it, while those on the western side are behind it.
When making a call from London to India, keep in mind that the two countries are in separate time zones. India is 4:30 hours ahead of London. If you're in London, the best time to accommodate all parties for a conference call or meeting is between 9:00 a.m. and 1:30 p.m. This will be a typical working period in India, between 1:30 and 6:00 p.m.
If you wish to contact someone in India and are available at any time, you can call between the hours of 2:30 a.m. and 6:30 p.m. This period will run from 7:00 a.m. to 11:00 p.m. in India time.
The time difference between India and the United Kingdom is now -4:30 hours.
Note: Since the late 19th century, "London" has also referred to the metropolitan area surrounding it, which was historically divided between the counties of Middlesex, Essex, Surrey, Kent, and Hertfordshire, but is now largely comprised of Greater London, the region governed by the Greater London Authority. For centuries, the national government and parliament have been housed in the City of Westminster, which is located to the west of the City.
 - Shopify)