UTC OffsetUTC-5
Acre Time (ACT) - Time Zone
ACT Time Converter — Convert Acre Time (UTC−05:00)
Convert Acre Time (ACT, UTC−05:00) to any time zone instantly. Because ACT never observes daylight saving, results stay accurate on every date — subtract 5 hours for UTC, add 2 for Brasília time.
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Acre Time (ACT): Brazil's UTC−05:00 Zone Explained
Acre Time (ACT) is Brazil's UTC−05:00 zone, used in Acre and western Amazonas. No daylight saving, two hours behind Brasília, identical to Peru and Colombia.
Acre Time (ACT) — Quick Facts
Offset: UTC−05:00
DST: No
Country: Brazil
Region: Acre and western Amazonas
Largest city: Rio Branco
IANA: America/Rio_Branco, America/Eirunepe
Abbreviation: ACT (Horário do Acre)
Acre Time runs 5 hours behind the base timezone (UTC) shown above, on every date of the year.
Converting Acre Time (ACT)
The rule is fixed: ACT + 5 hours = UTC, and UTC − 5 hours = ACT.
UTC | Acre Time (ACT) |
|---|---|
00:00 (12 AM) | 19:00 (7 PM), previous day |
09:00 (9 AM) | 04:00 (4 AM) |
12:00 (12 PM) | 07:00 (7 AM) |
17:00 (5 PM) | 12:00 (12 PM) |
21:00 (9 PM) | 16:00 (4 PM) |
Note the date rollback: any UTC time before 05:00 falls on the previous calendar day in Acre Time.
Is ACT the Acre Time Zone You Need?
The abbreviation ACT is reused elsewhere, so confirm the offset before relying on the letters:
| Offset | Region |
|---|---|---|
Acre Time — this zone | UTC−05:00 | Western Brazil |
ASEAN Common Time | UTC+07:00 to +09:00 (proposed) | Southeast Asia |
Legacy Java ACT alias | UTC+09:30 | Australia/Darwin |
Australian Capital Territory | UTC+10:00 / +11:00 |
For code, use the IANA identifiers rather than the abbreviation or a hardcoded offset — timestamps between mid-2008 and late 2013 in this region resolve to UTC−4.
Which Countries and Cities Use Acre Time (ACT)?
Acre Time is used in Brazil only — the entire state of Acre, plus the part of Amazonas west of the statutory line drawn from Tabatinga to Porto Acre.
City | Region | Note |
|---|---|---|
Rio Branco | Acre (capital) | Largest city in the zone; the only Brazilian state capital on UTC−5 |
Cruzeiro do Sul | Acre | Second hub, gateway to the upper Juruá |
Tabatinga | Amazonas | Triple-frontier river port on the Solimões |
Sena Madureira | Acre | Interior Acre |
Tarauacá | Acre | Interior Acre |
Feijó | Acre | Interior Acre |
Eirunepé | Amazonas | Carries its own IANA identifier |
Lábrea, Carauari, Benjamin Constant | Amazonas | Western Amazonas river towns |
Epitaciolândia, Brasileia | Acre | On the Bolivian border, where the clock changes |
Which Zones Share the Same Time as Acre Time (ACT)?
Zone | Offset | Where | Alignment with ACT |
|---|---|---|---|
PET — Peru Time | UTC−5 | Identical, all year | |
COT — Colombia Time | UTC−5 | Identical, all year | |
ECT — Ecuador Time | UTC−5 | Mainland Ecuador | Identical, all year |
EST (fixed) | UTC−5 | Identical, all year | |
EST / EDT | UTC−5 / −4 | Identical on standard time; 1 hour ahead on daylight time | |
CST / CDT | UTC−5 / −4 | Identical on standard time; 1 hour ahead on daylight time |
Lima, Bogotá, Quito and Panama City are permanent zero-offset partners. Zones that shift their clocks alternate between matching Acre Time and running one hour ahead of it.
Which Time Zones Border Acre Time (ACT)?
Direction | Neighbouring zone | Offset | Crossing the border |
|---|---|---|---|
East — Rondônia, eastern Amazonas | AMT — Amazon Time | UTC−4 | +1 hour |
BRT — Brasília Time | UTC−3 | +2 hours | |
West — Peru | PET | UTC−5 | No change |
North-west — Colombia | COT | UTC−5 | No change |
South — Bolivia | BOT | UTC−4 | +1 hour |
Acre Time is the only Brazilian zone whose offset matches the countries next door. Crossing from Tabatinga into Leticia in Colombia, or into Santa Rosa in Peru, requires no clock change; crossing into Bolivia or Rondônia does.
Why Acre Time (ACT) Is Set to UTC−05:00
Acre lies near 68° W, where local solar time sits roughly half an hour ahead of a UTC−5 clock: the sun reaches its highest point at about half past eleven rather than at noon. Close to the equator, the zone sees very little seasonal variation — day length stays between roughly 11 hours 45 minutes and 12 hours 30 minutes, and sunrise and sunset shift by only about half an hour between the extremes of the year. That stability is why the zone has never required a summer adjustment.
That half-hour margin is what turned the offset into a political question:
Date | Event |
|---|---|
18 Jun 1913 | Decree 2.784 establishes Brazil's four zones and places Acre in the fourth, GMT−5 |
24 Jun 2008 | Law 11.662 abolishes the UTC−5 zone; Acre and western Amazonas move to UTC−4, pushing sunrise close to half past four |
3 Oct 2010 | A referendum held with the general election returns a majority in favour of reverting |
30 Oct 2013 | Law 12.876 is sanctioned, repealing the 2008 law |
10 Nov 2013 | Clocks turn back one hour at midnight; Acre Time is restored |
2019 | Brazil abolishes daylight saving nationwide, formally ending a practice this zone had never adopted |
Western Amazonas has its own record of transitions, separate from Acre's — the reason America/Eirunepe exists as a distinct identifier even though both areas now share UTC−5.
Working With Acre Time (ACT)
Brazilian legal, banking and tax deadlines are published in Brasília time, two hours ahead. A late-afternoon BRT cut-off lands in mid-afternoon in ACT — the widest domestic gap in the country.
National broadcasting also runs on Brasília time, so live news and sport reach Acre two hours earlier in the local day than elsewhere in Brazil.
Flight timetables are printed in local time at each airport. A Rio Branco–Manaus route appears to lose an hour that it does not.
Working hours in Acre overlap fully with Peru, Colombia and Ecuador, and consistently with the US East Coast morning.
Compare Acre Time (ACT) With Another Zone
Use the search above to place ACT alongside the zones it interacts with most:
Search for | To answer |
|---|---|
BRT — Brasília Time | Brazilian deadlines, broadcasts, federal offices |
AMT — Amazon Time | Travel east into Rondônia or eastern Amazonas |
PET — Peru Time | Cross-border work with Peru on the same clock |
COT — Colombia Time | Leticia and the triple frontier |
EST — Eastern Time | US East Coast calls that shift twice a year |
UTC | Logs, timestamps and scheduling baselines |
Acre Time (ACT) — Frequently Asked Questions
Is Acre Time the same as UTC−5?
Yes. Acre Time is UTC−05:00 at all times.
Does Acre Time observe daylight saving?
No. The zone has never used it, and Brazil abolished daylight saving nationwide in 2019.
How do I convert UTC to Acre Time?
Subtract 5 hours. 09:00 UTC is 04:00 ACT; 17:00 UTC is 12:00 ACT.
How far behind Brasília is Acre Time?
Two hours — the largest gap between any Brazilian zone and the capital.
Which country uses Acre Time?
Brazil: the state of Acre and the western portion of Amazonas.
What is the largest city in Acre Time?
Rio Branco, capital of Acre and the only Brazilian state capital on UTC−5.
Is Acre Time the same as US Eastern Time?
The offsets match while the United States is on standard time. On US daylight time, Eastern Time runs one hour ahead of Acre Time.
Which IANA identifier should I use for Acre Time?
America/Rio_Branco for Acre, America/Eirunepe for western Amazonas. Avoid hardcoding the offset, since the region used UTC−4 between 2008 and 2013.