Time Zone Converter

When to use?

Use it to convert a meeting scheduled in your local time to an overseas participant's local time, or to check an overseas event time in your local time.

How to use

• Enter the date and time to convert.
• Choose the source time zone.
• Choose the target time zone.
• The converted time is shown.

Input Explanation

Enter the reference local time, its source time zone, and the target time zone you want the result in.

Calculation Basis

Using JavaScript Intl.DateTimeFormat and the IANA time-zone database, it normalizes the local time to UTC, then applies the target zone's offset (including DST) to format the date and time.

Usage Examples

• Convert meeting times - Convert a local meeting time to one specific overseas time zone.
• Check overseas event times - Convert an overseas event time to your local time.
• Organize trip schedules - Organize schedules reflecting the time difference between origin and destination.

Examples

• Seoul 3 PM (KST) → New York 1 AM (EST, winter)
• London 9 AM (GMT) → Seoul 6 PM (KST)

Cautions

• Check the target region's daylight saving period before converting.
• Time-zone settings can cause a one-day difference in some cases.

Guides

How to convert time zones

Choose a reference time and source zone to compute the time in one target zone. Good when a specific target zone is fixed, like a meeting invite.

Mind daylight saving

During DST the offset can shift by an hour. US Eastern uses UTC-5 in winter and UTC-4 in summer, so check the period.

FAQ

How is this different from the world clock?

The converter picks one source and one target zone for a 1:1 conversion. To compare many cities at once, use the world clock.

Is it processed in the browser?

Yes, it displays in the browser using the Intl API.

Is daylight saving reflected?

Yes. It uses the browser's time-zone data, so the region's DST is reflected automatically.

How is the time difference shown?

It shows both the source and target zone times so you can see the hour difference.

Related Tools

• World Clock Converter - Convert a given date and time to the local time of major cities and time zones at once.
• Meeting Time Finder - Find times where working hours overlap across multiple time zones.
• Unix Millisecond Converter - Auto-detect 10-digit second and 13-digit millisecond timestamps and convert to date/time.
• Timestamp Converter - Convert Unix timestamps to readable dates and dates back to Unix timestamps.
• Date Format Converter - Convert date and time into YYYY-MM-DD, ISO 8601, UTC, and Unix timestamp formats.
• Date Difference Calculator - Calculate the number of days between two dates, or the date N days from a reference date.