Port Blair mean time was the

time zone A time zone is an area which observes a uniform standard time for legal, Commerce, commercial and social purposes. Time zones tend to follow the boundaries between Country, countries and their Administrative division, subdivisions instead of ...

of the

Andaman and Nicobar Islands The Andaman and Nicobar Islands is a union territory of India comprising 572 islands, of which only 38 are inhabited. The islands are grouped into two main clusters: the northern Andaman Islands and the southern Nicobar Islands, separated by a ...

India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...

in the

Bay of Bengal The Bay of Bengal is the northeastern part of the Indian Ocean. Geographically it is positioned between the Indian subcontinent and the Mainland Southeast Asia, Indochinese peninsula, located below the Bengal region. Many South Asian and Southe ...

. The time zone was set up during the early 19th century and has been described as 17 minutes and 17 seconds (UTC+6:10:37) ahead of Calcutta Time (UTC+5:53:20). It remained in effect until 1 January 1906 when

Indian Standard Time Indian Standard Time (IST), sometimes also called India Standard Time, is the time zone observed throughout the Republic of India, with a time offset of UTC+05:30. India does not observe daylight saving time or other seasonal adjustments. I ...

became the official time of India.

References

* {{DEFAULTSORT:Port Blair Mean Time Time zones Geography of the Andaman and Nicobar Islands Time in India Port Blair