Time Zone Converter

How the Time Zone Converter Works

Our time zone converter lets you pick a date and time in one city and instantly see the corresponding time in another. It uses your browser's built-in Intl.DateTimeFormat engine with the timeZone option, so conversions follow the official IANA time zone database — including daylight saving time rules.

How Conversions Are Calculated

When you submit a date and time, the converter treats it as a local wall-clock time in the source time zone. It builds a UTC instant from that local time, then formats that instant in the target time zone. The time difference is the offset between the two zones at that moment, and the day-change indicator tells you whether the target date is the same day, the next day, or the previous day relative to the source.

Why Use a Time Zone Converter?

• Remote meetings: Schedule calls across teams in different countries without confusion.
• Travel: Figure out what time you land and adjust your plans accordingly.
• Deadlines: Know exactly when a submission or launch is due in another time zone.
• Global events: Watch live sports, webinars, or streams in your local time.

About Daylight Saving Time

Many regions shift their clocks forward in summer and back in winter. Because the converter uses live IANA time zone data, it automatically applies the correct DST offset for the date you enter — so a 9 AM meeting in New York converts differently in March than in January.

Understanding UTC and Time Zone Offsets

Coordinated Universal Time (UTC) is the reference point for all time zones. Every zone is expressed as an offset from UTC — for example, New York is UTC−5 in winter and UTC−4 in summer, while Tokyo is UTC+9 year-round. The converter works by first calculating the UTC instant that corresponds to the wall-clock time you enter in the source zone, then applying the target zone's offset to display the local time there. This is why the same wall-clock time can map to different UTC instants depending on the date: a 9 AM entry in New York in January represents 14:00 UTC, but 9 AM in July represents 13:00 UTC because of the daylight saving shift.

Handling the International Date Line

When a conversion crosses the Pacific, the target time can land on a different calendar date. The day-change indicator shows "next day" when the target date is ahead of the source date and "previous day" when it is behind. For example, 3 PM on Friday in Los Angeles (UTC−8) is 10 AM on Saturday in Sydney (UTC+11 during summer). This matters for deadlines and event timing — a Friday afternoon commitment in one country can be a Saturday morning obligation in another. Always check the day-change indicator when scheduling across the Pacific to avoid showing up on the wrong day.

Practical Examples

Here are some common conversions that illustrate how the tool works:

• Team call: 2 PM in New York is 7 PM in London and 11:30 PM in Mumbai — useful for finding a time that works across three regions.
• Flight arrival: A flight departs Los Angeles at 10 PM and lands in Tokyo at 5 AM local time — the converter confirms the 14-hour time difference.
• Webinar: A live webinar at 9 AM in Berlin is 6 PM in Sydney the same day, accounting for DST in both regions.
• Product launch: A midnight launch in San Francisco is 8 AM in London — the same instant, but a very different part of the day.
• Sports event: A 3 PM kickoff in London is 10 AM in New York and 11 PM in Tokyo, so fans know when to tune in.

Tips for Scheduling Across Time Zones

Always specify the time zone when sharing a meeting time — writing "3 PM" without a zone invites confusion. Use the "Use Now" button to see the current time in another zone at a glance, which is faster than entering a date and time manually. When planning recurring meetings, remember that DST changes can shift the offset by an hour twice a year, so a time that works in January may not work in July. For events with a global audience, consider publishing the time in UTC alongside the local zones, since UTC never changes. When comparing more than two zones, convert to one target first, then use that result as the source for the next conversion.