Time Zone Calculator
Current World Times
New York
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Los Angeles
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London
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Paris
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Mumbai
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Beijing
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Tokyo
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Sydney
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UTC Offsets
Related Calculators
Understanding Time Zones
What is UTC?
Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It is the successor to Greenwich Mean Time (GMT) and serves as the basis for civil time in most countries.
Daylight Saving Time
Many regions observe Daylight Saving Time (DST), moving clocks forward one hour in spring and back in fall. Not all countries observe DST, and those that do may change on different dates.
DST Note
This calculator uses standard time zone offsets. During Daylight Saving Time, add 1 hour to zones that observe DST. Always verify critical time conversions with official sources.
International Date Line
The International Date Line runs through the Pacific Ocean, roughly following the 180° longitude. When crossing from west to east, you subtract a day; from east to west, you add a day.
Business Tip
When scheduling international meetings, consider using UTC as a neutral reference. Many global businesses use UTC to avoid confusion about which time zone a meeting is based on.
Frequently Asked Questions
How do I convert between time zones?
Find the UTC offset for both zones and calculate the difference. EST (UTC-5) to PST (UTC-8) differs by 3 hours. 3:00 PM EST = 12:00 PM PST. Add hours going east, subtract going west.
What is UTC and why is it used?
UTC (Coordinated Universal Time) is the global time standard. It replaced GMT and doesn't observe daylight saving. Using UTC avoids confusion in international communication - all other time zones are expressed as offsets from UTC.
How does daylight saving time affect time zones?
When DST is active, clocks move forward 1 hour. EST (UTC-5) becomes EDT (UTC-4) in summer. Not all regions observe DST, and dates vary by country. Always verify when scheduling across time zones during DST transitions.
What is the International Date Line?
The IDL roughly follows 180 degrees longitude in the Pacific. Crossing west to east means subtracting a day; east to west means adding a day. It's why you can 'lose' or 'gain' a day on transpacific flights.