Time Zone Converter

What does this Time Zone Converter do?

This free online time zone converter lets you convert any date and time from one timezone to another instantly. Whether you're scheduling a meeting with someone in another country, checking what time a live stream starts in your local time, or just curious what time it is in Tokyo right now, this tool gives you an accurate answer in seconds.

Unlike tools that rely on fixed offsets (which break twice a year when daylight saving time changes), this converter uses the IANA timezone database built into your browser. That means it automatically handles daylight saving time, historical timezone changes, and future rule updates. When a country changes its DST rules, your conversion stays correct.

You can pick any date — past, present, or future — and the converter applies the correct offset for that specific moment in time. Everything runs locally in your browser, so your data never leaves your device.

How to convert time between time zones

1. Choose your source timezone: Select the timezone you're converting from in the "From" dropdown.
2. Choose your target timezone: Select the timezone you want to convert to in the "To" dropdown.
3. Pick a date and time: Use the date picker and time input to set the exact moment you want to convert. You can also click "Use Current Time" to fill in the current date and time instantly.
4. Click Convert: The converted time appears immediately, along with the day shift (same day, next day, or previous day), the time difference, and the UTC offsets for both zones.
5. Copy the result: Use the "Copy Result" button to grab a formatted summary you can paste into an email, calendar invite, or message.

Why use this Time Zone Converter?

Fixed offsets vs. IANA timezones: why it matters

Most broken time zone converters have the same root cause: someone stored a fixed number of hours. "New York is 5 hours behind London" is true for part of the year — but false for the rest, because the two places change their clocks on different dates. During those weeks, any converter using a fixed offset is confidently wrong.

This tool solves that problem by naming the place instead of the difference. Timezones have canonical IANA names like America/New_York or Asia/Tokyo, and those names carry all the rules with them — including historical changes, current offsets, and future DST transitions. When a government changes its timezone rules, the IANA database is updated, and your browser picks up the change automatically.

If you're building your own time-related features, the practical takeaway is: never store or calculate offsets yourself. Let the browser format the current moment for a named zone. This is built into every modern browser, it's free, and it's the single decision that separates a converter that works from one that will embarrass you in March.

Who uses a time zone converter?

Remote teams and distributed companies

• Schedule meetings that work across multiple timezones without doing the arithmetic yourself
• Check whether a teammate in another country is likely awake before sending a message
• See at a glance whether a client's office is open

Travelers and digital nomads

• Convert your flight departure and arrival times to local time
• Know when to call family back home without waking them up
• Check connecting flight times in the local timezone of the airport

Business and customer support

• Show customers your support hours in their local time
• Coordinate with international suppliers and partners
• Schedule webinars and calls for global audiences

Students and researchers

• Follow live events (conferences, launches, streams) happening in other countries
• Collaborate with classmates or colleagues across the world
• Understand historical timestamps in academic papers and data

Common time zone conversions

Here's a quick reference for some of the most frequently converted timezone pairs. Note that these offsets can change during daylight saving periods — this tool handles that automatically.

For the most reliable results, always use the IANA timezone name rather than the abbreviation. This tool uses IANA names internally, which is why it handles DST correctly and never confuses "CST" in Chicago with "CST" in Shanghai.

Frequently asked questions