Time Conversion Details
Time Difference
Hours between time zones
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Daylight Saving Time
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Business Hours Overlap
9 AM - 5 PM local
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Major World Clocks
Meeting Planner
Understanding Time Zones Worldwide
Time zones divide the world into 24 segments, each approximately 15° of longitude wide, corresponding to one hour of time difference.
Major Time Zones & Abbreviations
| Time Zone | UTC Offset | Major Cities | DST |
|---|---|---|---|
| Pacific Time (PT) | UTC-8 / UTC-7 | Los Angeles, Vancouver | Yes |
| Eastern Time (ET) | UTC-5 / UTC-4 | New York, Toronto | Yes |
| Greenwich Mean Time (GMT) | UTC+0 | London, Lisbon | No |
| Central European Time (CET) | UTC+1 / UTC+2 | Paris, Berlin | Yes |
| Japan Standard Time (JST) | UTC+9 | Tokyo, Seoul | No |
Daylight Saving Time Explained
Daylight Saving Time (DST) adjusts clocks forward 1 hour in spring ("spring forward") and back 1 hour in fall ("fall back"). Not all countries observe DST.
Spring Forward
2nd Sunday in March (US)
Last Sunday in March (EU)
Clocks move forward 1 hour
Fall Back
1st Sunday in November (US)
Last Sunday in October (EU)
Clocks move back 1 hour
Frequently Asked Questions
What's the International Date Line?
The 180° meridian where date changes. Cross eastward = lose a day, cross westward = gain a day.
How do I schedule meetings across time zones?
Find overlapping business hours (9 AM - 5 PM in both zones). Use 24-hour format to avoid AM/PM confusion.