All Time Zones
World Time Zones
The world is divided into 24 primary time zones, each offset from Coordinated Universal Time (UTC). Some zones use half-hour or quarter-hour offsets (like India at UTC+5:30 or Nepal at UTC+5:45).
UTC Offsets
UTC-12 to UTC-10: Pacific islands, Hawaii, parts of Alaska. UTC-9 to UTC-7: Alaska, US/Canada Pacific, Mountain. UTC-6 to UTC-5: US/Canada Central, Eastern, Mexico. UTC-4 to UTC-3: Atlantic Canada, Brazil, Argentina. UTC-2 to UTC-1: Mid-Atlantic, Azores, Cape Verde. UTC+0: UK, Ireland, Portugal, Iceland, West Africa. UTC+1 to UTC+2: Central/Eastern Europe, South Africa. UTC+3 to UTC+4: Moscow, East Africa, Gulf states. UTC+5 to UTC+5:30: Pakistan, India. UTC+6 to UTC+7: Bangladesh, Thailand, Vietnam. UTC+8: China, Singapore, Hong Kong, Philippines, Western Australia. UTC+9: Japan, South Korea. UTC+10 to UTC+11: Eastern Australia, Pacific islands. UTC+12 to UTC+13: New Zealand, Fiji, Samoa.
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How Time Zones Work
The world is divided into 24 primary time zones, each roughly 15 degrees of longitude wide, centered on meridians at 15-degree intervals from the Prime Meridian at Greenwich, England. In practice, time zone boundaries follow political borders rather than strict longitudinal lines, resulting in irregular shapes that accommodate national and regional preferences.
UTC (Coordinated Universal Time) serves as the global reference point from which all time zones are defined as positive or negative offsets. UTC+0 corresponds to Greenwich Mean Time, UTC+5:30 is India Standard Time, and UTC-8 is Pacific Standard Time. Some zones use half-hour or even quarter-hour offsets, including India at UTC+5:30, Nepal at UTC+5:45, and the Chatham Islands at UTC+12:45.
Time zone databases are maintained by the IANA (Internet Assigned Numbers Authority) and updated multiple times per year as governments change their timezone rules. These changes can include adopting or abandoning daylight saving time, shifting the base UTC offset, or splitting a region into multiple zones. Our tools use the latest IANA data to ensure accuracy.
About This Tool
This all time zones resource is designed to provide clear, actionable information. All data and calculations are processed locally in your browser for speed and privacy. We do not collect, store, or transmit any information you enter. Bookmark this page for quick return access whenever you need it.
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