Azores Summer Time (AZOST)

Azores Summer Time (AZOST) operates at UTC+0 and is observed during the daylight saving period in the Azores archipelago, an autonomous region of Portugal in the North Atlantic Ocean. AZOST is the daylight saving counterpart to Azores Time (AZOT), which is UTC−1 in winter. Sometimes referred to as "Azores Daylight Time," AZOST helps extend evening daylight hours in the summer months.

Importance and Global Use of AZOST

Azores Summer Time (AZOST) is important for supporting tourism, outdoor recreation, and local economic activities by aligning working hours with extended daylight during the summer. This adjustment improves energy use, supports businesses catering to visitors, and helps local communities enjoy more evening daylight.

Internationally, AZOST simplifies coordination with mainland Portugal, which observes Western European Summer Time (WEST), as well as with other European countries on daylight saving schedules. This synchronization facilitates smoother travel connections, shipping, and communications across the Atlantic region.

Where and When AZOST is used worldwide

Atlantic

Atlantic islands and territories using AZOST during summer and AZOT during winter:

• Azores (Portugal)

Other Time Zones in UTC +0

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

• Eastern Greenland Summer Time – EGST
• Greenwich Mean Time – GMT
• Western European Time – WET