🌍 UTC Standard
Coordinated Universal Time (UTC) is the primary time standard. All other time zones are expressed as positive or negative offsets from UTC.
Complete World Time Zones Reference
Comprehensive reference for all major world time zones, including abbreviations, UTC offsets, and major cities. Perfect for global business and travel planning.
Understanding Time Zones
Time zones are regions of the Earth that have the same standard time. The world is divided into 24 time zones, each representing one hour of the day. Here's what you need to know:
⏰ Daylight Saving
Many regions observe daylight saving time, moving clocks forward in spring and back in fall to make better use of daylight.
📅 Abbreviations
Time zones use standard abbreviations like EST, PST, GMT, etc. Some regions use different abbreviations for standard and daylight time.
World Time Zones by Region
North America
Eastern Time
EST/EDTUTC Offset: UTC-5/-4
Major Cities: New York, Toronto, Miami
Central Time
CST/CDTUTC Offset: UTC-6/-5
Major Cities: Chicago, Dallas, Mexico City
Mountain Time
MST/MDTUTC Offset: UTC-7/-6
Major Cities: Denver, Phoenix, Calgary
Pacific Time
PST/PDTUTC Offset: UTC-8/-7
Major Cities: Los Angeles, San Francisco, Vancouver
Alaska Time
AKST/AKDTUTC Offset: UTC-9/-8
Major Cities: Anchorage, Juneau
Hawaii Time
HSTUTC Offset: UTC-10
Major Cities: Honolulu
Europe
Greenwich Mean Time
GMT/BSTUTC Offset: UTC+0/+1
Major Cities: London, Dublin, Lisbon
Central European Time
CET/CESTUTC Offset: UTC+1/+2
Major Cities: Paris, Berlin, Rome, Madrid
Eastern European Time
EET/EESTUTC Offset: UTC+2/+3
Major Cities: Athens, Helsinki, Bucharest
Moscow Time
MSKUTC Offset: UTC+3
Major Cities: Moscow, St. Petersburg
Asia
India Standard Time
ISTUTC Offset: UTC+5:30
Major Cities: Mumbai, Delhi, Bangalore
China Standard Time
CSTUTC Offset: UTC+8
Major Cities: Beijing, Shanghai, Hong Kong
Japan Standard Time
JSTUTC Offset: UTC+9
Major Cities: Tokyo, Osaka, Seoul
Australian Eastern Time
AEST/AEDTUTC Offset: UTC+10/+11
Major Cities: Sydney, Melbourne, Brisbane
Australian Western Time
AWSTUTC Offset: UTC+8
Major Cities: Perth
Other Regions
Brazil Time
BRTUTC Offset: UTC-3
Major Cities: São Paulo, Rio de Janeiro
South Africa Time
SASTUTC Offset: UTC+2
Major Cities: Cape Town, Johannesburg
New Zealand Time
NZST/NZDTUTC Offset: UTC+12/+13
Major Cities: Auckland, Wellington
Interesting Timezone Facts
🕐 24 Time Zones
The world is divided into 24 time zones, each representing one hour of the day, based on the Earth's rotation.
🌅 Daylight Saving Time
About 70 countries observe daylight saving time, typically moving clocks forward in spring and back in fall.
📅 International Date Line
The International Date Line runs through the Pacific Ocean and marks where each day begins and ends.
🌍 UTC Reference
UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks and time.
⏰ Half-Hour Offsets
Some regions use half-hour offsets from UTC, like India (UTC+5:30) and Iran (UTC+3:30).
🌏 Largest Time Zone
China uses a single time zone (UTC+8) despite spanning five geographical time zones.
Quick Timezone Conversion Tips
🔄 Easy Conversions
- EST to PST: Subtract 3 hours
- EST to GMT: Add 5 hours (4 in summer)
- PST to GMT: Add 8 hours (7 in summer)
- EST to IST: Add 10.5 hours (9.5 in summer)
📱 Digital Tools
- Use our timezone converter for instant results
- Set multiple time zones in your calendar app
- Use world clock widgets on your phone
- Bookmark our world clock page for quick reference
💼 Business Tips
- Always specify timezone in meeting invitations
- Use 24-hour format for international communication
- Consider daylight saving time changes
- Provide multiple timezone references for clarity