Calculators
Timezone Converter
Convert times between different time zones worldwide. Schedule international meetings, plan calls across time zones, and find the best meeting times for global teams.
Use Timezone Converter to get instant results without uploads or sign-ups. Everything runs securely in your browser for fast, reliable output.
Your results will appear here.
About this tool
Time zones divide the world into regions that observe the same standard time, essential for coordinating activities across geographic distances. The world has about 38 different time zones ranging from UTC-12 to UTC+14, though local variations and Daylight Saving Time create many more. Our Timezone Converter handles all major time zones including EST/EDT, PST/PDT, GMT/BST, CET/CEST, JST, AEST, and many others. Understanding time zone differences is crucial for international business, remote work coordination, travel planning, and maintaining global relationships.
Daylight Saving Time (DST) adds complexity to timezone conversions. Many regions shift clocks forward one hour in spring and back in fall, but not all regions observe DST, and those that do change on different dates. For example, the U.S. changes in March/November while Europe changes in March/October, creating weeks where the time difference between New York and London is different than usual. Some countries like Japan, China, and India never use DST. Our converter accounts for these complexities by using the specific date you provide to determine whether DST is active in each timezone.
The International Date Line (roughly following the 180° meridian) is where the date changes by one day. When it's Monday 11 PM in American Samoa (UTC-11), it's Tuesday 7 PM in New Zealand (UTC+13) - they're 24 hours apart in time but one day apart in date. This affects international travel (crossing from U.S. to Asia "skips" a day) and business deadlines. Our converter shows when the date changes between time zones, crucial for understanding delivery dates, flight arrivals, and deadline synchronization across the Pacific.
For businesses and remote teams, finding overlapping working hours is essential. When coordinating between San Francisco (PST/PDT) and London (GMT/BST), there's an 8-hour difference. San Francisco 9 AM is London 5 PM - only the start of SF's day overlaps with end of London's day. Adding Sydney (AEDT) makes it nearly impossible to find common hours. Our converter helps identify the best meeting times by showing what time of day it is in each location - whether it's reasonable working hours, early morning, late evening, or overnight. All conversions are instant and performed privately in your browser with no data transmitted.
Usage examples
US East Coast to UK Business Call
Schedule 10 AM EST call, need to know London time
10:00 AM EST (New York) = 3:00 PM GMT (London). Time difference: 5 hours. During DST: 10:00 AM EDT = 3:00 PM BST (4 hour difference). Good meeting time - both in working hours. London team near end of day, NY team mid-morning. Consider: London might prefer earlier (NY 8 AM = London 1 PM) to end workday by 5 PM.
West Coast to Asia Conference
San Francisco team needs to call Tokyo office
San Francisco 5:00 PM PST = Tokyo 10:00 AM JST next day (+17 hours, crosses date line). Best overlap: SF evening (5-8 PM) = Tokyo morning (10 AM-1 PM). Alternatively: SF very early morning (6-9 AM) = Tokyo evening (11 PM-2 AM) - not ideal for Tokyo. Challenge: 17-hour difference means little natural overlap. Many tech companies solve this with "follow the sun" model where work passes between offices rather than live meetings.
Global Team Meeting - 3 Continents
Coordinate meeting across New York, London, and Singapore
NY 8:00 AM EST = London 1:00 PM GMT = Singapore 9:00 PM SGT. NY: Start of day (good). London: After lunch (good). Singapore: Late evening (poor - personal time). Rotating meeting times is fair: Meeting 1 (above), Meeting 2: NY 8 PM = London 1 AM next day = Singapore 9 AM (bad for London), Meeting 3: NY 5 AM = London 10 AM = Singapore 6 PM (bad for NY). Each region sacrifices once every three meetings.
Flight Arrival Time Understanding
Flight departs Los Angeles 11:00 PM PST, 13-hour flight to Tokyo
Depart: LAX 11:00 PM PST Monday. Add 13 hours: 12:00 PM PST Tuesday. Convert to JST: 12:00 PM PST Tuesday = 5:00 AM JST Wednesday (+17 hours, crosses date line). Arrive: NRT 5:00 AM Wednesday. You "lose" Tuesday - depart Monday night, arrive Wednesday morning. Return trip: You "gain" a day - depart Tokyo morning, arrive LAX same day (earlier time than departure!).
Webinar Scheduling for Maximum Attendance
Host webinar accessible to US, Europe, and Australia
7:00 AM PST = 10:00 AM EST = 3:00 PM GMT = 2:00 AM AEDT next day (Australia is excluded). 5:00 PM PST = 8:00 PM EST = 1:00 AM GMT next day = 12:00 PM AEDT next day (Europe is excluded). 8:00 PM PST = 11:00 PM EST = 4:00 AM GMT next day = 3:00 PM AEDT next day (only Australia is reasonable). Solution: Record webinar and offer three live Q&A sessions at region-appropriate times, or accept that one region watches recording.
How to use
- Select your source time zone (where you are or the time you have)
- Enter the time you want to convert (use 12-hour or 24-hour format)
- Enter the date for the conversion (important for DST changes)
- Select the target time zone (where you want to know the time)
- Click "Convert" to see the equivalent time in target zone
- View the time difference between zones in hours
- See helpful indicators for morning, afternoon, evening, night
- Check if the date changes across time zones
- Use for scheduling international meetings and calls
- Compare multiple time zones simultaneously for team coordination
Benefits
- Convert between 17+ major time zones worldwide
- Handles Daylight Saving Time for common regions
- Shows time difference in hours between zones
- Indicates when date changes across time zones
- Displays time of day context (morning, afternoon, evening, night)
- Perfect for scheduling international meetings and calls
- Essential for coordinating global remote teams
- Helps plan international travel and flight times
- Useful for understanding live event broadcast times
- No registration or personal information required
- Instant calculations with complete privacy
- Free forever with unlimited conversions
FAQs
What is UTC and how does it relate to time zones?
UTC (Coordinated Universal Time) is the world's time standard, replacing GMT (Greenwich Mean Time) in 1960. All time zones are expressed as UTC offset: UTC-5 (Eastern Time), UTC+0 (London/GMT), UTC+9 (Japan). The offset indicates hours ahead (+) or behind (-) UTC. For example, when it's 12:00 UTC, it's 7:00 AM in New York (UTC-5), 12:00 PM in London (UTC+0), and 9:00 PM in Tokyo (UTC+9). UTC never observes Daylight Saving Time - it's constant year-round. Time zones with DST have two offsets: EST is UTC-5 (winter), EDT is UTC-4 (summer).
Why do time zones have different Daylight Saving Time dates?
Each country/region sets its own DST rules based on local preferences and legislation. U.S./Canada "spring forward" second Sunday in March, "fall back" first Sunday in November. EU changes last Sunday in March and October. Australia (Southern Hemisphere) has opposite seasons, so DST runs October-April. Result: Time differences vary throughout the year. NY-London is normally 5 hours, but for 3 weeks in March (US changes first) it's 4 hours, and 1 week in November (US changes first) it's also 4 hours. Some countries never adopted DST (Japan, China, India, most of Africa) because benefits don't justify disruption.
What is the International Date Line and how does it work?
The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean, where the calendar date changes. Traveling west across the IDL, you add a day (Monday becomes Tuesday). Traveling east, you subtract a day (Tuesday becomes Monday). The line zigzags to keep island nations together time-wise. For example, Samoa and American Samoa are 60 miles apart but 24 hours different in time (and 1 day in date) because IDL runs between them. This affects: flights crossing Pacific (lose/gain a day), international deadlines (delivery "today" in Tokyo could be "yesterday" in Los Angeles), and daily communications (can't reach someone "same day" if they're 12+ hours ahead past midnight).
How do I find the best meeting time for a global team?
Method: (1) Identify all team members' time zones and typical working hours (usually 9 AM-5 PM local). (2) Convert one person's working hours to everyone else's zones. (3) Find overlap where all (or most) are in reasonable hours. (4) If no perfect overlap exists (common with 12+ hour differences), rotate meeting times so burden is shared - Meeting 1 favors Americas, Meeting 2 favors Europe, Meeting 3 favors Asia. Consider "core hours" where everyone is available vs "flexible hours." Tools: Shared calendar apps, time zone planning tools. Best practices: Record meetings for those who can't attend live, have written summaries, use asynchronous communication (Slack, email) when real-time isn't necessary.
Why does my flight arrive before it departs (same day)?
This happens when flying east across many time zones - you "chase the sun" and arrive in an earlier time zone. Example: Depart Tokyo 5:00 PM JST, fly 10 hours to Los Angeles, arrive 10:00 AM PST same day. How? Tokyo is 17 hours ahead. You fly 10 hours but "go back" 17 time zones, so you arrive 7 hours earlier (time-wise) than you left. Opposite happens westbound: depart LAX Monday night, arrive Tokyo Wednesday morning (skip entire Tuesday). This affects: jetlag direction (westbound is easier - follows natural circadian rhythm), scheduling (plan for "same day" arrival on eastbound flights), and date-specific tasks (contracts, deadlines, birthday celebrations).
Should I schedule meetings at the same time each week or adjust for all time zones?
Two philosophies: (1) Fixed time in one zone: "Meeting is always 10 AM New York time." Pros: Consistent for organizer, easy to remember. Cons: Attendees in other zones always have inconvenient time. Use for: Teams primarily in one region with few international members. (2) Rotating times: Alternate to accommodate all zones fairly. Pros: Shares burden, no one always suffers. Cons: Harder to schedule, different people miss different meetings. Use for: Truly distributed teams. Compromise: "Core hours" fixed meetings for critical topics (those with inconvenient time must attend or watch recording), rotating times for optional/informational meetings. Most important: Be explicit about which time zone you're referencing (say "10 AM EST" not "10 AM").
How do I avoid confusion when communicating time across zones?
Best practices: (1) Always state time zone: "3 PM EST" not "3 PM." (2) Specify whether DST: "3 PM EDT" (Daylight) vs "3 PM EST" (Standard). (3) Use UTC when possible: "Meeting at 19:00 UTC" is unambiguous. (4) Include multiple zones: "10 AM PST / 1 PM EST / 6 PM GMT." (5) Use ISO 8601 format: "2024-03-15T14:00:00-05:00" includes date and offset. (6) Calendar invites: Modern calendar apps (Google, Outlook) automatically convert times to each person's local zone - use them. (7) Confirm verbally: "Just to confirm, this is your 8 AM, right?" (8) Consider tools: World Time Buddy, Every Time Zone show multiple zones at once. Most confusion comes from assumptions - always be explicit.
Do all countries observe Daylight Saving Time?
No. About 70 countries observe DST, primarily in North America, Europe, and parts of Australia/New Zealand. Most countries near the equator don't (daylight doesn't vary much by season). Countries that never use DST: Japan, China, India, Indonesia, most of Africa, most of South America (except Chile/Brazil partially), and many others. Countries that abolished DST: Russia (stopped 2014), Turkey (stopped 2016), many are reconsidering due to health/economic concerns. U.S. states can opt out: Hawaii and Arizona don't observe DST (except Navajo Nation in AZ does). Europe is considering eliminating DST but countries can't agree. When scheduling internationally, always check whether both locations observe DST and when they change.
Related tools
View all tools401k Calculator with Employer Match
Free 401k calculator with employer match formulas, IRS limits, catch-up contributions, and inflation adjustment. Calculate retirement savings, maximize employer match, and see year-by-year growth projections.
CalculatorsAge Calculator
Calculate your exact age in years, months, days, hours, and minutes. Find out how old you are, how many days until your next birthday, or the age difference between two people.
CalculatorsBMI Calculator
Calculate your Body Mass Index (BMI) instantly with our free BMI calculator. Support for metric (kg, cm) and imperial (lbs, ft, in) units. Get your BMI classification and healthy weight range.
Calculators