Western Greenland Summer Time (WGST)

Western Greenland Summer Time (WGST) operates at UTC−1 as the daylight saving time observed in most of western Greenland. It is the summer counterpart to Western Greenland Time (WGT, UTC−2) and is sometimes simply called "Greenland Daylight Time." WGST typically runs from late March to late October, providing an extra hour of evening daylight for communities such as Nuuk and other coastal settlements. Previously, until March 2023, WGST operated at UTC−2, with standard time at UTC−3, before Greenland advanced its time zone by one hour to the current offsets.

Importance and Global Use of WGST

WGST helps communities in western Greenland make better use of the long daylight hours during the Arctic summer, supporting social activities, tourism, and extended business operations. By shifting an hour forward, WGST improves coordination for local transport, education, healthcare, and public services, which are vital across remote and widely separated settlements.

On an international level, WGST aligns Greenland's time zone more closely with key partners in Europe and the North Atlantic, facilitating smoother scheduling for trade, scientific cooperation, and Arctic policy initiatives. This predictable daylight saving adjustment helps maintain Greenland's integration with its neighbors and supports cross-border communication and collaboration.

Where and When WGST is used worldwide