Question

if it is 12noon at greenwhich .what will be the time at Mexico (99°w)
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Answer 1

Answer:

It depends on the time of year.

From the last Sunday of March until the day before the last Sunday of October, when Greenwich is on British Summer Time (BST/UTC+1), 12 noon BST at Greenwich = 4:30 PM INST in India.

From the last Sunday of October until the day before the last Sunday of March, when Greenwich is on Greenwich Mean Time (GMT/UTC), 12 noon GMT at Greenwich = 5:30 PM INST in India.