World Time Zones

Understanding Time Zones

Time zones divide the world into regions that observe the same standard time. They are generally offset from Coordinated Universal Time (UTC) by whole hours, though some zones use 30 or 45-minute offsets.

How Time Zones Work

• The world has 24 primary time zones, one for each hour of the day
• Time zones follow political boundaries, not strict longitude lines
• Many regions observe Daylight Saving Time, shifting clocks by 1 hour seasonally
• Some large countries like Russia and the US span multiple time zones

Common Time Zone Abbreviations

Time zones are often referred to by abbreviations like EST (Eastern Standard Time), PST (Pacific Standard Time), GMT (Greenwich Mean Time), and CET (Central European Time). Visit our timezone abbreviations guide for a complete list.