India Standard Time (IST) is the time zone observed throughout India and Sri Lanka.
India, despite its size, only has one time zone. The country stretches 3000 km (about 1800 miles) from west to east, spanning roughly 30 degrees of longitude. In the US, this would be the same as Utah and New York sharing one very large time zone.
If the country were to base its time zones on solar time, it would he three 15-degree time zones, but since it only has one, the Sun rises almost two hours earlier in Dong in the far east than in Bhuj in the west.
A single time zone, like India has, can lead to a decline in sleep quality because of later sunsets.
All institutions across India follow IST. The school day starts at almost the same time everywhere, but children go to bed later and he reduced sleep in areas where the Sun sets later.
India is one of the few large countries that uses a single national time zone. The 5:30 offset was chosen as a compromise to cover the country’s east–west span.
IST Is the Only Indian Time ZoneIn everyday usage, IST is often simply referred to as Indian Time. India Standard Time (IST) is a standard time zone fixed at UTC+5:30. India and Sri Lanka do not use Daylight Sing Time, so IST remains the same throughout the year.
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Where and When is IST Observed? Asia Asian countries using IST all year: India Sri Lanka