Time zone · Americas
AST
Argentina Standard Time
Argentina Standard Time (AST) keeps all twelve Argentine member zones steady at UTC−03:00 year-round, so you can plan with confidence—no daylight saving surprises across the country. Whether you're coordinating with Buenos Aires or Mendoza, the clock never shifts, making this single, predictable offset a quiet superpower for teams and travelers who hate recalibrating.
Sunday, May 31, 2026
Current offset
UTC-03:00
Standard · -03
Daylight saving
Not observed
Year-round standard time
IANA zones
12
None observe daylight saving
DST offset
—
No summer variant
About AST
A fixed, year-round offset.
Argentina Standard Time (AST) keeps all twelve Argentine member zones steady at UTC−03:00 year-round, so you can plan with confidence—no daylight saving surprises across the country. Whether you're coordinating with Buenos Aires or Mendoza, the clock never shifts, making this single, predictable offset a quiet superpower for teams and travelers who hate recalibrating.
IANA zones · the technical identifiers
The 12 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.
Cities currently on AST
The same hour, city by city.
1 city · all UTC-03:00
Where AST is used
One country.
Same offset · UTC-03:00
Other zones at UTC-03:00 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 doesn't Argentina observe daylight saving time?
- Argentina hasn't used daylight saving changes since 2009; the country locked in a permanent UTC−03:00 zone, joining most of its continental neighbors in keeping things simple and predictable.
- How many cities share the same time?
- All 12 member zones—from Buenos Aires to Salta and Río Gallegos—sit at UTC−03:00, so whether you call from Cordoba or Jujuy, the hour feels the same.
- Which side of the clock is AST on globally?
- AST sits three hours behind Greenwich Mean Time (UTC−03:00), placing it in sync with parts of South America that also keep clocks steady year-round.
- Is it safe to schedule meetings without DST worries?
- Yes—Argentina hasn't shifted since 2021; the current UTC−03:00 offset holds firm throughout the year, and no future daylight saving is expected.
- Does this cover the whole country?
- Every corner of Argentina falls inside this single standard zone—whether urban Buenos Aires or remote Río Gallegos, the time is always the same.
- How does AST compare with nearby regions?
- AST runs slightly ahead of Brazil's main zones but aligns perfectly with Uruguay and eastern Chile; it is a steady bridge across a patchwork of neighbors.
- Any quirks or exceptions?
- All 12 member zones are locked to UTC−03:00, but you'll see the abbreviation "-03" showing the simplicity—no daylight saving, no regional splits.
- How late do time changes go?
- None—Argentina dropped clock tampering in 2009; the nation holds tempo with no daylight saving shifts since, and the latest system note is from May 2021.
Free · Developer API
Time, as JSON.
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