Time zone · Americas
AST
Acre Standard Time
Acre Standard Time (AST) is a fixed clock — there are no daylight‑saving surprises, no twice‑yearly jumps; Brazil’s far‑west Acre region simply stays at UTC‑05:00 all year.
Friday, June 5, 2026
Current offset
UTC-05:00
Standard · -05
Daylight saving
Not observed
Year-round standard time
IANA zones
2
None observe daylight saving
DST offset
—
No summer variant
About AST
A fixed, year-round offset.
Acre Standard Time (AST) is a fixed clock — there are no daylight‑saving surprises, no twice‑yearly jumps; Brazil’s far‑west Acre region simply stays at UTC‑05:00 all year.
IANA zones · the technical identifiers
The 2 zones that resolve to AST.
For software, always store the IANA identifier — never the abbreviation alone. The database keeps these zones distinct because their rules can, and historically did, diverge.
Where AST is used
One country.
Same offset · UTC-05:00
Other zones at UTC-05:00 right now.
These named zones share AST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Frequently asked questions
Common questions about AST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Why does AST never change for daylight saving?
- Both member zones in AST last observed a time change in 2013 and have kept a permanent UTC‑05:00 offset since then, so AST lives life in steady winter mode.
- How many zones share Acre Standard Time?
- Only two: Eirunepe and Rio Branco, both clocks ticking side‑by‑side in Brazil’s sun‑rich western frontier.
- Is AST the same as Eastern Standard Time?
- Nope—AST sits two full hours behind, anchoring itself at UTC‑05:00 while Eastern Time dances through EDT and EST.
- What’s special about the Acre region’s time history?
- After a 2013 shift, Acre chose stability over summer tweaks, letting its clocks match the Amazon’s timeless rhythm.
- Do any member zones ever deviate from UTC‑05:00?
- Never; since the 2013 transition, both Eirunepe and Rio Branco march in perfect UTC‑05:00 step.
- Which countries use Acre Standard Time?
- Brazil alone—its remote Acre state, tucked along the Amazon basin, runs on this constant clock.
- Why choose Eirunepe as AST’s pin?
- Eirunepe’s UTC‑05:00 anchor makes it the steady heartbeat of Acre Standard Time.
- What’s the next time change for AST?
- None scheduled; AST’s last dance was 2013, and it’s been a fixed UTC‑05:00 ever since.
- How does AST affect global scheduling?
- With no DST, AST offers a reliable UTC‑05:00 slot—perfect for cross‑border calls without seasonal surprises.
Free · Developer API
Time, as JSON.
Every IANA time zone with live offsets, DST status, and the countries and cities that use them — clean, dependable JSON. Sign up free and get an API key in seconds.
countries, cities, convert, DST transitions coming next.
Get your free API key →