Time Zone Converter – Quick, Accurate, and Free

Welcome to the Addition.site Time Zone Converter – the simplest way to translate a date and time from one time zone to another. Whether you’re planning an international trip, scheduling a virtual meeting, or just curious about what time it is in Tokyo when it’s noon in New York, this tool gives you instant, reliable results.

How It Works

1. Enter the date and time
   • Click the calendar icon next to the date/time field.
   • Choose the exact date and time you want to convert.
   • The input accepts the standard HTML 5 datetime-local format (e.g., 2025‑08‑16 14:30).

2. Select the “from” zone
   • Pick the time zone of the original date/time.
   • The drop‑down currently lists:
   – UTC (Coordinated Universal Time)
   – America/New_York (New York, Eastern Standard/Daylight Time)
   – Asia/Tokyo (Tokyo, Japan Standard Time)
   • You can add more zones later if needed.

3. Select the “to” zone
   • Choose the destination time zone from the same list.
   • The converter will automatically account for daylight‑saving changes where applicable.

4. Click Convert**
   • The converted time appears in the read‑only result field.
   • The format is MM/DD/YYYY, HH:MM AM/PM (US style) and reflects the local time of the chosen “to” zone.

5. Copy or Share
   • Click the result field to copy the converted time to your clipboard.
   • Hit the 𝕏 button to share the conversion directly on X (formerly Twitter).
   • All actions are instant and require no sign‑ups.

What Is a Time Zone?

A time zone is a region of the Earth that observes a uniform standard time for legal, commercial, and social purposes. The world is divided into 24 primary zones, each offset from UTC by a whole number of hours (e.g., UTC‑5 for Eastern Time, UTC+9 for Tokyo). Some zones observe Daylight Saving Time (DST), shifting the clock one hour forward during summer months.

Use Cases

Tips & Best Practices

• Check DST: If you’re converting between zones that observe daylight saving, verify whether DST is in effect on the chosen date. The converter automatically handles this, but it’s good to double‑check for critical deadlines.
• Use UTC for consistency: When in doubt, convert everything to UTC first, then to your local zone. This eliminates confusion.
• Keep the browser updated: The JavaScript uses the browser’s built‑in Intl API, which relies on the operating system’s time‑zone database. Make sure your device’s clock and time‑zone settings are current.

About This Tool

• Free, no‑login – Use it anytime, anywhere.
• Open‑source – The code is available on GitHub for anyone to review or extend.
• Mobile‑friendly – Works on phones, tablets, and desktops.
• Privacy‑first – No data is stored or sent to third parties.

Frequently Asked Questions

Q: Why does the result sometimes show a different date?
A: The conversion may cross a midnight boundary, causing the date to shift. The displayed date reflects the local date in the target zone.

Q: Can I convert to a time zone not listed?
A: Currently the drop‑downs include only UTC, New York, and Tokyo. Future releases will support additional zones. You can also manually enter the IANA time‑zone string (e.g., Europe/London) if the browser accepts it.

Q: How accurate is the conversion?
A: It uses the browser’s Intl.DateTimeFormat API, which follows the IANA time‑zone database. Accuracy is equivalent to that of your device’s system clock.

Ready to convert?
Enter your date/time, pick the zones, hit Convert, and you’re done. Share the result on X or copy it for your notes. Happy traveling, meeting, and planning!