Falkland Islands Summer Time (FKST)

Falkland Islands Summer Time (FKST) operates at UTC−3 and is the official time used year-round in the Falkland Islands. Historically, FKST referred to daylight saving time in summer, while standard time (FKT) was UTC−4. Since 2011, however, the islands have maintained FKST permanently throughout the year, and it is sometimes informally referred to as "Falkland Islands Standard Time" today.

Importance and Global Use of FKST

FKST provides a stable and practical time standard for the Falkland Islands, supporting government functions, military activities, and local economic operations without the need for seasonal clock changes. This permanent UTC−3 setting helps simplify scheduling, transport logistics, and communication within the islands and with the United Kingdom, which administers them as an overseas territory.

In a global context, FKST has limited commercial or civilian influence beyond the islands themselves, but its stability benefits fisheries, tourism, and international shipping routes in the South Atlantic. A consistent time zone reduces confusion in maritime navigation, international coordination, and trade with partners in South America and beyond.

Where and When FKST is used worldwide

Atlantic

Atlantic islands and territories using FKST all year:

• Falkland Islands

Other Time Zones in UTC -3

Other time zones share the same offset as Falkland Islands Summer Time (FKST), but are known by different names. While their clocks align, they may represent different regions or countries based on local time zone definitions.

• Atlantic Daylight Time – ADT
• Argentina Time – ART
• Brasília Time – BRT
• Chile Summer Time – CLST
• French Guiana Time – GFT
• Pierre & Miquelon Standard Time – PMST
• Paraguay Summer Time – PYST
• Paraguay Time – PYT
• Suriname Time – SRT
• Uruguay Time – UYT