Calcutta Time

Calcutta time was one of the two time zones established in British India in 1884.wikipedia
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Indian Standard Time

ISTUTC+05:30local time
Calcutta time was described as being 23 minutes and 20 seconds ahead of Indian standard time and one hour, two minutes and 20 seconds ahead of Bombay Time (UTC+5:53:20).
After independence in 1947, the Indian government established IST as the official time for the whole country, although Kolkata and Mumbai retained their own local time (known as Calcutta Time and Bombay Time) until 1948 and 1955, respectively.

Madras Time

It has also been described as 32 minutes and 6 seconds ahead of Madras Time (UTC+5:53:20).
It has been described as 8 minutes and 46 seconds from UTC+05:30 and 32 minutes and 6 seconds behind Calcutta Time which puts it at (UTC+05:21:14).

Bombay Time

Calcutta time was described as being 23 minutes and 20 seconds ahead of Indian standard time and one hour, two minutes and 20 seconds ahead of Bombay Time (UTC+5:53:20).

Time zone

Sri Lanka Standard Time Zonetime zoneslocal time
Calcutta time was one of the two time zones established in British India in 1884.

Presidencies and provinces of British India

British IndiaIndiaBritish
Calcutta time was one of the two time zones established in British India in 1884.

International Meridian Conference

1884 prime meridian systemabandonedcontemporaneously
It was established during the International Meridian Conference held at Washington, D.C. in the United States.

Washington, D.C.

Washington, DCWashington D.C.District of Columbia
It was established during the International Meridian Conference held at Washington, D.C. in the United States.

United States

AmericanU.S.USA
It was established during the International Meridian Conference held at Washington, D.C. in the United States.

India

IndianRepublic of IndiaIND
It was decided that India had two time zones: Calcutta (now Kolkata) would use the 90th meridian east and Bombay (Mumbai) the 75th meridian east.

Kolkata

CalcuttaSouth KolkataCalcutta, India
It was decided that India had two time zones: Calcutta (now Kolkata) would use the 90th meridian east and Bombay (Mumbai) the 75th meridian east.

90th meridian east

90°E90° E80°E
It was decided that India had two time zones: Calcutta (now Kolkata) would use the 90th meridian east and Bombay (Mumbai) the 75th meridian east.

Mumbai

BombayMumbai, IndiaMumbai, Maharashtra
It was decided that India had two time zones: Calcutta (now Kolkata) would use the 90th meridian east and Bombay (Mumbai) the 75th meridian east.

75th meridian east

75°E longitude7575.0°E
It was decided that India had two time zones: Calcutta (now Kolkata) would use the 90th meridian east and Bombay (Mumbai) the 75th meridian east.

UTC+05:30

UTC+5:30local timeUTC+5:53:20
It has also been described as 32 minutes and 6 seconds ahead of Madras Time (UTC+5:53:20).

Lytton Strachey

Giles Lytton StracheyLyttonG. L. Strachey
Willian Strachey, an uncle of Lytton Strachey was said to have visited Calcutta once and then "kept his own watch set resolutely to Calcutta time, organizing the remaining fifty-six years of his life accordingly".

James Clavell

Michaela Clavell James ClavellMichaela Ross
James Clavell, in his novel King Rat, refers to news broadcasts as occurring in "Calcutta time".

King Rat (Clavell novel)

King RatKing Rat (1962 novel)King Rat'' (1962 novel)
James Clavell, in his novel King Rat, refers to news broadcasts as occurring in "Calcutta time".

Railway time

Railway time in IndiaRailway time of IndiaStandard railway time

Bangladesh Standard Time

BSTBangladesh TimeUTC+06:00
Between 1890 and 1941, the Bengal region was under British Raj and used Calcutta time (UTC+5:53:20).