Calcutta Time
E32409
Calcutta Time was a former local time standard used in Kolkata (then Calcutta) before the adoption of a unified national time zone in India.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Calcutta Time canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T247373 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Calcutta Time Context triple: [Indian Standard Time, previousTimeSystemsIncluded, Calcutta Time]
-
A.
Bombay Time
Bombay Time was a former local time standard used in the city of Bombay (now Mumbai) before the adoption of a unified national time across India.
-
B.
Palashi
Palashi is a town in West Bengal, India, historically renowned as the site of the pivotal 1757 Battle of Plassey that marked the beginning of major British colonial dominance in India.
-
C.
Star of India
The Star of India is a historic emblem and chivalric order created by the British Crown to honor loyalty and service among princes and officials in colonial India.
-
D.
The Ball
The Ball is the popular nickname for Reunion Tower, a distinctive geodesic observation tower and Dallas landmark known for its glowing spherical top.
-
E.
Shantaram
Shantaram is a novel by Gregory David Roberts that follows an Australian fugitive who builds a new life in the underworld of Bombay, blending adventure, crime, and spiritual exploration.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Calcutta Time Target entity description: Calcutta Time was a former local time standard used in Kolkata (then Calcutta) before the adoption of a unified national time zone in India.
-
A.
Bombay Time
Bombay Time was a former local time standard used in the city of Bombay (now Mumbai) before the adoption of a unified national time across India.
-
B.
Palashi
Palashi is a town in West Bengal, India, historically renowned as the site of the pivotal 1757 Battle of Plassey that marked the beginning of major British colonial dominance in India.
-
C.
Star of India
The Star of India is a historic emblem and chivalric order created by the British Crown to honor loyalty and service among princes and officials in colonial India.
-
D.
The Ball
The Ball is the popular nickname for Reunion Tower, a distinctive geodesic observation tower and Dallas landmark known for its glowing spherical top.
-
E.
Shantaram
Shantaram is a novel by Gregory David Roberts that follows an Australian fugitive who builds a new life in the underworld of Bombay, blending adventure, crime, and spiritual exploration.
- F. None of above. chosen
Statements (37)
| Predicate | Object |
|---|---|
| instanceOf |
local time
ⓘ
time standard ⓘ |
| alsoKnownAs | Calcutta local time ⓘ |
| appliesTo |
city of Calcutta
ⓘ
city of Kolkata ⓘ
linked to:
Calcutta
|
| basedOn | local mean time at Calcutta ⓘ |
| classification | historical time zone ⓘ |
| coexistedWith |
Bombay Time
ⓘ
Indian Standard Time ⓘ Madras Time ⓘ |
| country | India ⓘ |
| differenceFromGMTInMinutes | 353.3333 ⓘ |
| differenceFromISTInMinutes | −5.6667 ⓘ |
| geographicReference | longitude of Calcutta ⓘ |
| historicalContext | colonial India ⓘ |
| historicalSignificance | illustrates pre-unification local times in India ⓘ |
| namedAfter | Calcutta ⓘ |
| regionType | single-city time ⓘ |
| replacedBy | Indian Standard Time ⓘ |
| replacedLocalTimesIn | none (was itself a local time) ⓘ |
| standardizedBy | local authorities in Calcutta ⓘ |
| status | defunct ⓘ |
| timeType | mean solar time ⓘ |
| timeZoneOffset | UTC+05:53:20 ⓘ |
| timeZoneOffsetFromIST | −0:05:40 ⓘ |
| timeZoneOffsetFromUTCInMinutes | 353.3333 ⓘ |
| timeZoneOffsetHours | UTC+5.8889 ⓘ |
| usedBefore | Indian Standard Time ⓘ |
| usedBy |
colonial administration in Calcutta
ⓘ
residents of Calcutta ⓘ |
| usedFor |
civil timekeeping in Calcutta
ⓘ
railway timetables in Calcutta ⓘ |
| usedIn |
Calcutta
ⓘ
Kolkata ⓘ
linked to:
Calcutta
|
| usedInCentury |
19th century
ⓘ
20th century ⓘ |
| usedUntil | mid-20th century ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Calcutta Time Description of subject: Calcutta Time was a former local time standard used in Kolkata (then Calcutta) before the adoption of a unified national time zone in India.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.