America/Guyana

Time zone identifier: America/Guyana

Current civil offset: -04:00 (-04)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1911-08-01

Local Mean Time (LMT): -03:52:39 based on geographic meridian

Total recorded transitions: 4 transitions across 4 distinct offsets

Associated countries: GY

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Historical Offset Step Chart (1880 to Present)

-5:00 -4:00 -3:00 -2:00 1880 1900 1920 1940 1960 1980 2000 2020

Text summary: America/Guyana shifted between 4 distinct offsets from 1911-08-01 through the modern era.

Complete Transition History (4 Transitions)

UTC Instant Local Wall Time Shift Abbreviation DST Effect
1911-08-01T03:52:39Z 1911-07-31 23:52:39 -03:52:39 → -04:00 -04 No overlap
1915-03-01T04:00:00Z 1915-03-01 00:15:00 -04:00 → -03:45 -0345 No gap
1975-08-01T03:45:00Z 1975-08-01 00:45:00 -03:45 → -03:00 -03 No gap
1992-03-29T04:00:00Z 1992-03-29 00:00:00 -03:00 → -04:00 -04 No overlap

Notes from the Maintainers

Source: southamerica (Lines 1637 to 1668)
Guyana

From P Chan (2020-11-27):
https://books.google.com/books?id=5-5CAQAAMAAJ&pg=SA1-PA547
The Official Gazette of British Guiana. (New Series.) Vol. XL. July to
December, 1915, p 1547, lists as several notes:
"Local Mean Time 3 hours 52 mins. 39 secs. slow of Greenwich Mean Time
(Georgetown.) From 1st August, 1911, British Guiana Standard Mean Time 4
hours slow of Greenwich Mean Time, by notice in Official Gazette on 1st July,
1911.  From 1st March, 1915, British Guiana Standard Mean Time 3 hours 45
mins. 0 secs. slow of Greenwich Mean Time, by notice in Official Gazette on
23rd January, 1915."

https://parliament.gov.gy/documents/acts/10923-act_no._27_of_1975_-_interpretation_and_general_clauses_(amendment)_act_1975.pdf
Interpretation and general clauses (Amendment) Act 1975 (Act No. 27 of 1975)
[dated 1975-07-31]
"This Act...shall come into operation on 1st August, 1975."
"...where any expression of time occurs...the time referred to shall signify
the standard time of Guyana which shall be three hours behind Greenwich Mean
Time."

Circular No. 10/1992 dated 1992-03-20
https://dps.gov.gy/wp-content/uploads/2018/12/1992-03-20-Circular-010.pdf
"...cabinet has decided that with effect from Sunday 29th March, 1992, Guyana
Standard Time would be re-established at 01:00 hours by adjusting the hands
of the clock back to 24:00 hours."
Legislated in the Interpretation and general clauses (Amendment) Act 1992
(Act No. 6 of 1992) [passed 1992-03-27, published 1992-04-18]
https://parliament.gov.gy/documents/acts/5885-6_of_1992_interpretation_and_general_clauses_(amendment)_act_1992.pdf

Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]

Attributed Statements:

P Chan (2020-11-27):

https://books.google.com/books?id=5-5CAQAAMAAJ&pg=SA1-PA547 The Official Gazette of British Guiana. (New Series.) Vol. XL. July to December, 1915, p 1547, lists as several notes: "Local Mean Time 3 hours 52 mins. 39 secs. slow of Greenwich Mean Time (Georgetown.) From 1st August, 1911, British Guiana Standard Mean Time 4 hours slow of Greenwich Mean Time, by notice in Official Gazette on 1st July, 1911. From 1st March, 1915, British Guiana Standard Mean Time 3 hours 45 mins. 0 secs. slow of Greenwich Mean Time, by notice in Official Gazette on 23rd January, 1915." https://parliament.gov.gy/documents/acts/10923-act_no._27_of_1975_-_interpretation_and_general_clauses_(amendment)_act_1975.pdf Interpretation and general clauses (Amendment) Act 1975 (Act No. 27 of 1975) [dated 1975-07-31] "This Act...shall come into operation on 1st August, 1975." "...where any expression of time occurs...the time referred to shall signify the standard time of Guyana which shall be three hours behind Greenwich Mean Time." Circular No. 10/1992 dated 1992-03-20 https://dps.gov.gy/wp-content/uploads/2018/12/1992-03-20-Circular-010.pdf "...cabinet has decided that with effect from Sunday 29th March, 1992, Guyana Standard Time would be re-established at 01:00 hours by adjusting the hands of the clock back to 24:00 hours." Legislated in the Interpretation and general clauses (Amendment) Act 1992 (Act No. 6 of 1992) [passed 1992-03-27, published 1992-04-18] https://parliament.gov.gy/documents/acts/5885-6_of_1992_interpretation_and_general_clauses_(amendment)_act_1992.pdf Zone NAME STDOFF RULES FORMAT [UNTIL]

Years on Record

Methodology Note: The 1970 Rule

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