Timezone Converter

Convert times between global timezones

Free online timezone converter. Easily convert times between 30+ major timezones worldwide. Perfect for scheduling web conferences with overseas colleagues, finding optimal times for international calls, calculating arrival times for international travel, and more. Browser-based, privacy protected.

How to Use

Convert timezones in 3 steps:

Step 1: Enter Source Date and Time
Enter the source date and time, then select the source timezone (default: Japan Standard Time)
Step 2: Select Target Timezone
Choose the target timezone from 30+ options (USA, Europe, Asia, Oceania, etc.)
Step 3: View Conversion Result
The conversion result is displayed instantly. You can see the date, day of week, time, and time difference at a glance

All conversions are performed in your browser. Your date and time data is not sent to any server.

Timezone Conversion Tool

Source Date and Time

Date

Time

Timezone

Target Date and Time

Timezone

Conversion Result

--:--

Practical Use Cases

Timezone converter is useful in various scenarios:

1. Scheduling International Web Conferences

Coordinate meeting times with overseas offices or clients. For example, instantly confirm that a 3:00 PM Japan meeting is 1:00 AM in New York or 6:00 AM in London. Easily find a convenient time for everyone. Essential tool for scheduling recurring meetings with global teams.

2. Finding Optimal Times for International Calls

Check the local time before calling family, friends, or business partners abroad. Avoid calling during late night or early morning hours, and choose a convenient time for the recipient. Especially useful for communicating with countries with significant time differences (USA, Europe, Oceania).

3. Calculating Arrival Times for International Travel

Check flight arrival times in local time for international trips. Easily handle complex time difference calculations, such as departing Japan at night and arriving in Los Angeles the same morning. Useful for checking connection times, hotel check-in times, and coordinating local schedules.

4. Checking Global Event and Live Stream Times

Check the Japan time for sports events, music concerts, and product launches held overseas. Never miss Apple product announcements (US time), European soccer matches (European time), or F1 races (worldwide). Perfect for managing streaming schedules.

5. Confirming Stock and Forex Market Hours

Check opening and closing times of major markets like NYSE, London Stock Exchange, and Tokyo Stock Exchange in Japan time. Track FX market opening hours and never miss important economic indicator announcements. Essential tool for global investing.

What is Timezone Conversion?

Timezone conversion is the process of converting time from one region to another. The Earth is divided into 24 timezones, with each region using different standard times.

How Timezones Work

Timezones have 1-hour differences for every 15 degrees of longitude. Based on UTC (Coordinated Universal Time), time advances eastward and delays westward. Example: Japan Standard Time (JST) is UTC+9, New York (EST) is UTC-5. In regions with Daylight Saving Time (DST), the time difference changes seasonally.

Time Differences from Major Timezones

Time differences from Japan (JST UTC+9) to major cities: New York -14 hours, Los Angeles -17 hours, London -9 hours, Paris -8 hours, Sydney +1 hour, Seoul 0 hours (same), Singapore -1 hour. Understanding these differences facilitates smooth international communication and business.

Browser-Based Privacy

This timezone converter uses JavaScript to perform conversions entirely in your browser. Your date and time data is never sent to any server, ensuring complete privacy protection. Works offline with no communication errors. Safe for converting sensitive schedule information.

Frequently Asked Questions

Does it account for Daylight Saving Time (DST)?

Yes, this tool automatically accounts for Daylight Saving Time in each timezone. For example, Eastern Time (EST/EDT) and Central European Time (CET/CEST) are automatically adjusted based on the season. Accurate time differences are calculated based on the input date, ensuring precise conversions year-round.

What is UTC?

UTC (Coordinated Universal Time) is the world's time standard. Formerly known as GMT (Greenwich Mean Time). All timezones are expressed as offsets (+ or -) from UTC. Example: Japan (JST) is UTC+9, New York (EST) is UTC-5. Widely used in international communications and aviation industry.

What if a country has multiple timezones?

Large countries like the USA, Canada, Russia, and Australia have multiple timezones. This tool allows you to select timezones by major city. Example: For USA, choose from Eastern (New York), Central (Chicago), Mountain (Denver), or Pacific (Los Angeles). Select the timezone closest to your destination city.

What happens when crossing the International Date Line?

When crossing the International Date Line (central Pacific), the date changes by one day. For example, converting from Japan to Hawaii, the date goes back one day. This tool automatically accounts for the date line, displaying accurate dates and times. Safe for use in trans-Pacific travel or business.

Can I convert past or future dates?

Yes, you can convert both past and future dates. Useful for trip planning, checking past event times, setting future meeting schedules, and more. However, DST start/end dates may vary by year, so there might be slight discrepancies for dates several years in the future.

What do timezone abbreviations (JST, EST, CET, etc.) mean?

Timezone abbreviations indicate regional standard times. JST=Japan Standard Time, EST=Eastern Standard Time, PST=Pacific Standard Time, CET=Central European Time, GMT=Greenwich Mean Time, etc. During DST, a D (Daylight) is added at the end (e.g., EDT=Eastern Daylight Time). Frequently used abbreviations in international communication.

Can it help with jet lag preparation?

Yes, checking the local time at your destination in advance can help with jet lag preparation. You can gradually adjust to the local time rhythm before departure or plan your post-arrival schedule in local time. Especially important for time differences of 5+ hours, advance preparation is crucial.

What's the difference from a world clock?

A world clock displays current times in multiple cities simultaneously, while a timezone converter converts specific dates and times to other timezones. It can convert future or past dates and is specialized for specific time conversions like meeting scheduling. More flexible and practical for specific use cases.