Time zone · Americas
UST
Uruguay Standard Time
Uruguay Standard Time (UST), set at UTC-03:00, keeps things simple in the Sunshine-sprinkled coasts of Montevideo—where clocks stay steady year-round thanks to Uruguay’s permanent daylight saving-free policy, making it one of Latin America’s most timezone-predictable nations for remote teams craving schedule stability. Since 2015, this sole representative zone has held its ground without a single DST flicker, letting global collaborators skip the twice-yearly clock chaos entirely.
Friday, June 5, 2026
Current offset
UTC-03:00
Standard · -03
Daylight saving
Not observed
Year-round standard time
IANA zones
1
None observe daylight saving
DST offset
—
No summer variant
About UST
A fixed, year-round offset.
Uruguay Standard Time (UST), set at UTC-03:00, keeps things simple in the Sunshine-sprinkled coasts of Montevideo—where clocks stay steady year-round thanks to Uruguay’s permanent daylight saving-free policy, making it one of Latin America’s most timezone-predictable nations for remote teams craving schedule stability. Since 2015, this sole representative zone has held its ground without a single DST flicker, letting global collaborators skip the twice-yearly clock chaos entirely.
IANA zones · the technical identifiers
The zone that resolve to UST.
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 UST
The same hour, city by city.
1 city · all UTC-03:00
Where UST is used
One country.
Same offset · UTC-03:00
Other zones at UTC-03:00 right now.
These named zones share UST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Frequently asked questions
Common questions about UST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Does Uruguay observe daylight saving time?
- No—and it hasn’t since 2015. Uruguay permanently ditched daylight saving after years of summer shifts to simplify logistics and energy planning.
- How does UST compare to neighboring time zones?
- It matches Brasília Time (BRT) year-round, making cross-border work with Brazil straightforward—no seasonal misalignment worries.
- Why did Uruguay abolish daylight saving?
- The government ended DST in 2015 to reduce confusion in transport schedules, school routines, and energy grids that previously shifted twice yearly.
- What is the local standard time in Montevideo?
- Montevideo lives on UTC-03:00 all year; there’s no spring forward or fall back—just consistent -03 for every meeting invite.
- Are there any UST quirks for remote workers?
- Since UST never changes, you can set your calendar once and forget it—no mid-year DST drift with New York or Europe.
- Is there only one official time zone in Uruguay?
- Yes, the entire country uses America/Montevideo as its single IANA zone, so every Uruguayan timestamp is locked to UTC-03.
Free · Developer API
Time, as JSON.
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