Historically distinct IANA time zone
America/Managua
- Countries
- Nicaragua
- GPS reference
- 12.15° N, 86.28° W
- Data source
- IANA northamerica
- Aliases
- None
- Rule groups
- Nic
NicaraguaGeographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 12.15° N, 86.28° W. Associated countries: NI.
The Wikipedia link provides additional context; it is not evidence for a historical claim. Transition data comes from the IANA source file.
Notes from the time database
The story behind the clock
These source notes describe a period or rule. They do not, by themselves, establish a causal claim for a particular clock change.
Nicaragua This uses Shanks & Pottenger for times before 2005. I've got reports from 8 different people that Nicaragua just started DST on Sunday 2005-04-10, in order to save energy because of expensive petroleum. The exact end date for DST is not yet announced, only "September" but some sites also say "mid-September". Some background information is available on the President's official site: The Decree, no 23-2005 is available here: The decree doesn't say anything about daylight saving, but for now let's assume that it is daylight saving.... The Associated Press story on the time change, which can be found at The tzdata source notes: "The last time that a change of clocks was applied to save energy was in the year 2000 during the Arnoldo Alemán administration."... The northamerica file says that Nicaragua has been on UTC-6 continuously since December 1998. I wasn't able to find any details of Nicaraguan time changes in 2000. Perhaps a note could be added to the northamerica file, to the effect that we have indirect evidence that DST was observed in 2000. From Jesper Nørgaard Welen (2005-11-02): Nicaragua left DST the 2005-10-02 at 00:00 (local time). (2005-09-26) From Jesper Nørgaard Welen (2006-05-05): (my informal translation) By order of the president of the republic, Enrique Bolaños, Nicaragua advanced by sixty minutes their official time, yesterday at 2 in the morning, and will stay that way until 30th of September. From Jesper Nørgaard Welen (2006-09-30): My informal translation runs: The natural sun time is restored in all the national territory, in that the time is returned one hour at 01:00 am of October 1 of 2006.
Original IANA source file: northamerica.
A shared present
Same clock today, different past
These nearby zones follow the same current annual pattern, yet retain their own historical record.
Honduras · 239 km from the reference location · Same annual clock since 2007
Costa Rica · 344 km from the reference location · Same annual clock since 2007
El Salvador · 360 km from the reference location · Same annual clock since 2007Civil-time record
Recorded changes over time
From 1889 to 2006 · 16 recorded transitions
Recurring daylight-saving changes are grouped separately when JavaScript is available.
Notable changes
One-off changes and transitions outside the recurring seasonal rhythm.
- -05:45 · MMTStandard time applies
- -06:00 · CSTStandard time applies
- -05:00 · ESTStandard time applies
- -06:00 · CSTStandard time applies
- -05:00 · CDTDaylight saving time begins
- -06:00 · CSTStandard time applies
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1889-12-31 23:59 | -05:45 | MMT | Standard time |
| 1934-06-22 23:45 | -06:00 | CST | Standard time |
| 1973-05-01 01:00 | -05:00 | EST | Standard time |
| 1975-02-15 23:00 | -06:00 | CST | Standard time |
| 1979-03-18 01:00 | -05:00 | CDT | Daylight saving time |
| 1979-06-24 23:00 | -06:00 | CST | Standard time |
| 1980-03-16 01:00 | -05:00 | CDT | Daylight saving time |
| 1980-06-22 23:00 | -06:00 | CST | Standard time |
| 1992-01-01 05:00 | -05:00 | EST | Standard time |
| 1992-09-23 23:00 | -06:00 | CST | Standard time |
| 1993-01-01 01:00 | -05:00 | EST | Standard time |
| 1996-12-31 23:00 | -06:00 | CST | Standard time |
| 2005-04-10 01:00 | -05:00 | CDT | Daylight saving time |
| 2005-10-01 23:00 | -06:00 | CST | Standard time |
| 2006-04-30 03:00 | -05:00 | CDT | Daylight saving time |
| 2006-10-01 00:00 | -06:00 | CST | Standard time |