Timezone Converter
Source Timezone
Select Date & Time
Target Timezone
Select timezones and date/time to convert
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About Timezone Converter
Convert time across different timezones. Free online timezone converter tool.
How to Use
Step 1
Select your source timezone from the dropdown (50+ cities available)
Step 2
View the current time in the source timezone
Step 3
Select the date you want to convert
Step 4
Select the time you want to convert (or click 'Use Current Time')
Step 5
Select your target timezone from the dropdown
Step 6
View the current time in the target timezone
Step 7
Click 'Convert' to see the converted time
Step 8
View the converted date and time in the target timezone
Step 9
Check the time difference and UTC offsets for both timezones
Step 10
Use the swap button (⇄) to quickly reverse source and target
Features & Benefits
- ✅Convert time across 50+ major timezones worldwide
- ✅Timezones organized by region: Americas, Europe, Asia, Pacific, Africa
- ✅Live current time display for both source and target timezones
- ✅Real-time clock updates every second
- ✅Select any date and time for conversion
- ✅Quick 'Use Current Time' button for instant conversion
- ✅Swap timezones button for quick reversal
- ✅View timezone abbreviations (EST, PST, GMT, etc.)
- ✅See UTC offsets for both timezones
- ✅Calculate time difference in hours and minutes
- ✅Automatic DST (Daylight Saving Time) handling
- ✅Shows full date and time with day of week
- ✅12-hour format with AM/PM
- ✅Grouped timezone dropdown by region
- ✅Timezone offset shown in dropdown (e.g., UTC-5/-4)
- ✅Color-coded current time displays
- ✅Large, easy-to-read converted time display
- ✅Helpful note about DST variations
- ✅100% browser-based - data never sent to server
- ✅100% free - no limits, no signup required
FAQs
How does timezone conversion work?
Timezone conversion calculates the equivalent time in a different timezone by accounting for the UTC offset difference. Each timezone has an offset from UTC (Coordinated Universal Time). For example, New York is UTC-5 (EST) or UTC-4 (EDT), and London is UTC+0 (GMT) or UTC+1 (BST). To convert, we add or subtract the offset difference. When it's 12:00 PM in New York (UTC-5), it's 5:00 PM in London (UTC+0), a 5-hour difference.
What is DST and how does it affect timezone conversion?
DST (Daylight Saving Time) is the practice of moving clocks forward by 1 hour during warmer months to extend evening daylight. Not all countries or regions observe DST, and those that do change on different dates. This converter automatically accounts for DST based on the selected date. For example, New York uses EST (UTC-5) in winter and EDT (UTC-4) in summer. Always check the specific date when scheduling international meetings.
Why do some timezones have two offsets (e.g., UTC-5/-4)?
Two offsets indicate that the timezone observes Daylight Saving Time. The first offset is the standard time (winter), and the second is the daylight time (summer). For example, New York shows UTC-5/-4 because it's UTC-5 during EST (November-March) and UTC-4 during EDT (March-November). The converter automatically uses the correct offset based on your selected date.
How do I schedule a meeting across multiple timezones?
Use this converter to find a suitable time for all participants. For example, if you want a meeting at 10:00 AM in New York, convert to each participant's timezone: London (3:00 PM), Tokyo (11:00 PM), Sydney (1:00 AM next day). Choose a time that works for everyone's business hours. Generally, 9 AM-5 PM is considered working hours. Avoid early morning or late evening times for participants.
What's the difference between GMT and UTC?
GMT (Greenwich Mean Time) and UTC (Coordinated Universal Time) are essentially the same for practical purposes—both represent the time at 0° longitude. UTC is the modern standard used in computing and international timekeeping, while GMT is the older term still commonly used. Technically, UTC is more precise (atomic clock-based), but for timezone conversion, they're interchangeable. London uses GMT in winter and BST (British Summer Time, UTC+1) in summer.
Why is the time difference not a whole number of hours?
Some timezones have 30-minute or 45-minute offsets from UTC. For example, India is UTC+5:30, Nepal is UTC+5:45, and parts of Australia use UTC+9:30. This creates time differences like 5.5 hours or 10.5 hours between certain cities. These offsets were chosen for geographical, political, or historical reasons to better align with local solar time.
How do I convert time for a future date?
Select the future date in the date picker, enter the time, and click Convert. The converter automatically accounts for DST changes that may occur between now and the future date. This is important for scheduling events months in advance, as DST transitions can shift the time difference by 1 hour. Always verify the converted time closer to the event date.
What if my city isn't listed?
Select a major city in the same timezone as your location. For example, if you're in Philadelphia, use New York (both are EST/EDT). If you're in Osaka, use Tokyo (both are JST). Most cities within a country share the same timezone. You can also search online for your city's timezone (e.g., 'Paris timezone') and select a listed city with the same offset.
How do I know if a timezone observes DST?
Timezones that observe DST show two offsets in the dropdown (e.g., UTC-5/-4). The converter automatically applies the correct offset based on your selected date. Generally, most of North America, Europe, and parts of Australia observe DST, while most of Asia, Africa, and South America do not. DST typically runs from spring to fall in each hemisphere.
Can I use this for historical dates?
Yes, you can select any date, past or future. However, be aware that timezone rules, DST observance, and offsets have changed over time. Some countries have changed their timezone or stopped observing DST in recent years. For very old historical dates (before 1970), results may not be accurate. For recent history (last 20 years), the converter should be reliable.
What's the best time for international meetings?
The best time depends on the timezones involved. For US-Europe meetings, 2-4 PM ET (7-9 PM London) works well. For US-Asia meetings, early morning or late evening is often necessary due to the 12+ hour difference. For Europe-Asia meetings, morning in Europe (afternoon in Asia) is ideal. Use this converter to find overlapping business hours (typically 9 AM-5 PM) for all participants.
Why does the current time update every second?
The converter shows live current times for both selected timezones to help you understand the real-time difference. This is useful for knowing 'what time is it right now in Tokyo?' while you're scheduling. The live clock updates every second to provide accurate, real-time information. The converted time you calculate is static based on your selected date and time.
Is my timezone data secure?
Yes! All timezone conversions happen entirely in your browser using JavaScript. Your selected timezones, dates, and times never leave your device and are not sent to any server, ensuring complete privacy and security.