Time zone · Americas
AST
Acre Standard Time
Acre Standard Time (AST) is a fixed UTC-05:00 zone used in western Brazil, with no daylight saving adjustments—making scheduling straightforward for residents and collaborators in this Amazon-region time zone.
Saturday, May 30, 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 UTC-05:00 zone used in western Brazil, with no daylight saving adjustments—making scheduling straightforward for residents and collaborators in this Amazon-region time zone.
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].
- Does Acre Standard Time observe daylight saving time?
- No, AST does not observe daylight saving time; it remains at UTC-05:00 year-round.
- Which Brazilian cities use Acre Standard Time?
- The primary cities in AST are Eirunepe and Rio Branco, both located in the state of Acre in western Brazil.
- What is the current time in Acre Standard Time?
- The current time in AST is always UTC-05:00, with no seasonal changes.
- How does AST compare to other Brazilian time zones?
- AST is one hour behind Brasilia Time (BRT, UTC-03:00) and is used only in the far western part of Brazil.
- Why was Acre Standard Time created?
- It reflects the geographic position of Acre state, which lies far west of the country's main population centers.
- Is AST used outside of Brazil?
- No, AST is exclusive to Brazil, specifically in the state of Acre.
- What countries border regions using AST?
- AST borders Peru (UTC-05:00) and Bolivia (UTC-04:00), facilitating cross-border coordination.
- How does AST affect international business?
- Its fixed offset simplifies planning with partners in North America’s Eastern Time zone during standard time.
Free · Developer API
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