UYST — Uruguay Summer Time
See what UYST means, its UTC-2 offset, how it relates to daylight saving time in Uruguay, and convert it to other time zones.
How to Convert UYST to Other Time Zones
Open the UYST converter page: Go to https://www.xconvert.com/time-converter/uyst-time-zone to open the visual comparison tool with Uruguay Summer Time (UYST, UTC-2) as the reference row. This page is useful when you need to line up summer business hours in Uruguay with teams in places like New York, London, or São Paulo for client calls, shipping updates, or regional support coverage.
Add comparison cities: Click + Add City and search for cities that commonly interact with Uruguay, such as Buenos Aires for Río de la Plata business coordination, New York for finance and US client meetings, or Madrid for European headquarters and trade discussions. Adding these rows lets you compare UYST against real operating hours in each market instead of manually calculating offsets.
Select a working time range on the grid: Click Select, then drag across the UYST row to highlight a block such as 9:00 AM to 11:00 AM UYST; the purple selection will immediately show the matching local times in every other row. For example, 9:00 AM UYST is 7:00 AM in New York during Eastern Standard Time and 12:00 PM in London during GMT, which helps confirm whether a Montevideo morning meeting works better for Europe than for the US East Coast.
Export or share the result: After selecting the range, use the export options shown above the grid: ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is especially helpful if you are scheduling a seasonal meeting during Uruguay’s summer period and want every participant to receive the event in their own local time without rechecking offsets manually.
About Uruguay Summer Time (UYST)
UYST stands for Uruguay Summer Time. Its exact offset is UTC-2, meaning local time in UYST is 2 hours behind Coordinated Universal Time and 1 hour ahead of Uruguay Standard Time (UYT, UTC-3).
UYST is associated with Uruguay during periods when daylight saving time is in effect. In practical terms, it has historically been used for cities such as Montevideo, the capital and largest city of Uruguay, whose metropolitan population is roughly 1.3 million, as well as other populated areas including Salto, Paysandú, and Punta del Este when the country observed summer time nationally.
Because UYST is UTC-2, it differs from several major business zones in predictable ways. It is 3 hours ahead of New York when New York is on Eastern Standard Time (UTC-5), so 9:00 AM in New York is 12:00 PM in UYST; it is 2 hours behind London during GMT (UTC+0), so 9:00 AM in UYST is 11:00 AM in London. These comparisons matter for cross-border banking, agricultural exports, logistics, and travel planning across the South Atlantic and the Americas.
The same UTC-2 offset is also shared by abbreviations such as BRST, FNT, GST, O, PMDT, and WGST, but those abbreviations refer to different regional time conventions and should not be treated as interchangeable labels. For scheduling, the offset may match while the legal time-zone name, daylight saving rules, and city usage can differ.
UYST and Daylight Saving Time
UYST is a daylight saving time designation rather than a year-round standard time. When active, it represents Uruguay’s clocks being moved forward from Uruguay Standard Time (UYT, UTC-3) to Uruguay Summer Time (UYST, UTC-2), typically to extend evening daylight during the Southern Hemisphere summer.
Historically, Uruguay switched to UYST in the spring and returned to UYT in the autumn, usually around October and March. A typical historical pattern was moving clocks forward by 1 hour at 2:00 AM local time in early October, then moving clocks back by 1 hour at 2:00 AM local time in March, although exact government decrees determined the precise dates each season.
For the current year, 2026, Uruguay does not have an active daylight saving transition scheduled, because the country has not been observing DST in recent years and remains on UYT (UTC-3) year-round in practice. That means there is no official 2026 switch date into UYST and no 2026 switch date back from UYST under the current national timekeeping policy.
This distinction is important if you see UYST in historical records, older calendar systems, aviation references, or archived meeting data. If you are scheduling a present-day call with Montevideo, you should verify current local time based on Uruguay Standard Time (UTC-3) rather than assuming summer time is currently in effect.
Frequently Asked Questions
What does UYST stand for?
UYST stands for Uruguay Summer Time. It is the daylight saving time label historically used when Uruguay advanced clocks by one hour for the summer season, changing from UTC-3 to UTC-2.
Is UYST the same as GMT?
No, UYST is not the same as GMT. GMT is UTC+0, while UYST is UTC-2, so UYST is 2 hours behind GMT; when it is 12:00 PM GMT, it is 10:00 AM in UYST.
Which cities use UYST?
UYST is tied to Uruguay, so the main city associated with it is Montevideo, along with other Uruguayan cities such as Salto, Paysandú, Maldonado, and Punta del Este during periods when daylight saving time was observed nationally. In current practice, Uruguay is not actively using UYST year-round, so these cities generally operate on UYT (UTC-3) unless policy changes.
What is the UTC offset for UYST?
The UTC offset for UYST is UTC-2. That means you subtract 2 hours from UTC to get local UYST time, or viewed another way, UYST is 1 hour ahead of Uruguay Standard Time (UTC-3).
When does UYST change?
Historically, UYST changed when Uruguay entered or exited daylight saving time, usually with a 1-hour clock change between UYT (UTC-3) and UYST (UTC-2). However, for 2026, there is no current official DST change scheduled in Uruguay, because the country has suspended seasonal clock changes in recent years.
Is UYST currently used in Uruguay?
In historical and reference contexts, yes, UYST is a valid abbreviation for Uruguay’s summer daylight time. In real current scheduling, however, Uruguay currently operates on standard time year-round, so most live business, travel, and calendar planning for Montevideo should use UTC-3, not UYST.
How far is UYST from UTC?
UYST is 2 hours behind UTC. If the current UTC time is 18:00, the corresponding UYST time would be 16:00, which is useful when converting timestamps from international systems, cloud logs, or airline and shipping data.
Why does UYST appear in old calendars or meeting records?
UYST often appears in archived systems because many calendar platforms, operating systems, and enterprise databases preserve historical daylight saving rules. If you are reviewing an old event from Uruguay during a summer season when DST was active, the timestamp may correctly display as UYST (UTC-2) even though Uruguay no longer uses that seasonal change today.