Asia/Calcutta

Time zone identifier: Asia/Calcutta

Current civil offset: +05:30 (IST)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1854-06-27

Local Mean Time (LMT): +05:53:28 based on geographic meridian

Total recorded transitions: 7 transitions across 5 distinct offsets

Historical Offset Step Chart (1880 to Present)

Text summary: Asia/Calcutta shifted between 5 distinct offsets from 1854-06-27 through the modern era.

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1854-06-27T18:06:32Z`	`1854-06-27 23:59:52`	+05:53:28 → +05:53:20	`HMT`	No	overlap
`1869-12-31T18:06:40Z`	`1869-12-31 23:27:50`	+05:53:20 → +05:21:10	`MMT`	No	overlap
`1905-12-31T18:38:50Z`	`1906-01-01 00:08:50`	+05:21:10 → +05:30	`IST`	No	gap
`1941-09-30T18:30:00Z`	`1941-10-01 01:00:00`	+05:30 → +06:30	`+0630`	Yes	gap
`1942-05-14T17:30:00Z`	`1942-05-14 23:00:00`	+06:30 → +05:30	`IST`	No	overlap
`1942-08-31T18:30:00Z`	`1942-09-01 01:00:00`	+05:30 → +06:30	`+0630`	Yes	gap
`1945-10-14T17:30:00Z`	`1945-10-14 23:00:00`	+06:30 → +05:30	`IST`	No	overlap

tzdb guarantees accuracy for timestamps from 1970 onwards. Transitions prior to 1970 represent best-effort historical reconstructions.